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REVIEW article

Front. Psychol., 16 October 2014
Sec. Cognition
This article is part of the Research Topic Psychological perspectives on expertise View all 36 articles

Metacognition and action: a new pathway to understanding social and cognitive aspects of expertise in sport

  • 1Department of Physical Education and Sport Sciences, University of Limerick, Limerick, Ireland
  • 2Department of Psychology, University of Limerick, Limerick, Ireland
  • 3School of Psychology, University College Dublin, Dublin, Ireland
  • 4School of Public Health, Physiotherapy and Population Science, University College Dublin, Dublin, Ireland

For over a century, psychologists have investigated the mental processes of expert performers – people who display exceptional knowledge and/or skills in specific fields of human achievement. Since the 1960s, expertise researchers have made considerable progress in understanding the cognitive and neural mechanisms that underlie such exceptional performance. Whereas the first modern studies of expertise were conducted in relatively formal knowledge domains such as chess, more recent investigations have explored elite performance in dynamic perceptual-motor activities such as sport. Unfortunately, although these studies have led to the identification of certain domain-free generalizations about expert-novice differences, they shed little light on an important issue: namely, experts’ metacognitive activities or their insights into, and regulation of, their own mental processes. In an effort to rectify this oversight, the present paper argues that metacognitive processes and inferences play an important if neglected role in expertise. In particular, we suggest that metacognition (including such processes as “meta-attention,” “meta-imagery” and “meta-memory,” as well as social aspects of this construct) provides a window on the genesis of expert performance. Following a critique of the standard empirical approach to expertise, we explore some research on “metacognition” and “metacognitive inference” among experts in sport. After that, we provide a brief evaluation of the relationship between psychological skills training and metacognition and comment on the measurement of metacognitive processes. Finally, we summarize our conclusions and outline some potentially new directions for research on metacognition in action.

Introduction

Expertise is characterized by superior reproducible performances and “refers to the characteristics, skills, and knowledge that distinguish experts from novices and less experienced people” (Ericsson, 2006a, p. 3). Quintessentially, sport provides many such instances. For example, when Lewis (Lewis and Marx, 1996) became the first track and field athlete to win four consecutive Olympic titles, he accomplished this feat with a long jump of 8 m 50 cm, winning by a margin of 21 cm. Sport is a domain that provides benchmarks to distinguish experts from novices, through performance outcomes (e.g., podium placing), player statistics (e.g., batting average in baseball) or competition level (e.g., Olympic vs. Collegiate). Given such criteria, it is not surprising that the question of how one becomes an expert within the sport domain has been of increasing scientific (Ericsson, 2014; Hambrick et al., 2014a) and popular interest (Ross, 2006; Gladwell, 2008) in the two decades since Ericsson’s seminal paper on deliberate practice. “Deliberate practice presents performers with tasks that are initially outside their current realm of reliable performance, yet can be mastered within hours of practice by concentrating on critical aspects and by gradually refining performance through repetitions after feedback” (Ericsson, 2006b, p. 692). Although subject of much debate (e.g., Baker and Young, 2014; Detterman, 2014), the theory of deliberate practice and the development of expertise both warrant further analyses. This paper adds to the expertise debate by presenting a novel argument contending that metacognitive processes are central to expertise in the sport context. Furthermore, we suggest that some of the aforementioned controversies in the research literature, that stem from conflict between those focused largely on exploring the role of automaticity in skilled performance, and researchers focused on understanding the representation of experts knowledge, may have led to the explanatory role of metacognition being overlooked.

In this review we propose that our understanding of aspects of both social and cognitive dimensions of sporting expertise can be adequately explained from a metacognitive perspective. The potential of metacognitive inferences and domain-general skills including psychological skills training (PST) are posited as integral to the genesis of expert performance. Subsequently, the contribution of both mental imagery (e.g., mental practice) and attentional strategies (e.g., routines) to our understanding of expertise and metacognition will be discussed. Finally, new directions for future research that emanate from our metacognitive perspective on sporting expertise will be outlined. Firstly, however, in the rationale for our approach we will attempt to answer the following questions: are there limits to the current expertise approach? Why is sport an appropriate field of study? And finally, what is metacognition?

Are there Limits to the Expertise Approach?

Historically, the rich tapestry of research on expert performance has been interwoven with a common thread-the study of grandmasters in chess (Williams and Ericsson, 2005). Investigations into expertise in chess, a competitive sporting activity that was rule bound, amenable to measurement through objective ratings (e.g., ELO rankings), with a range of possible contextual requirements (e.g., blindfold chess; Campitelli and Gobet, 2005) led to a proliferation of literature on the topic (de Groot, 1965; Chase and Simon, 1973; Holding, 1985, 1992). Chess is a challenge of perceptual-cognitive skill and thus provides a fitting laboratory for testing constructs such as pattern recognition, visual imagery, and memory (Bilalic et al., 2010). Sport in the more traditional sense emphasizes motor skill execution under stressful conditions typically in a dynamic environment (Baker and Young, 2014). One legacy of the chess expertise literature was that this perceptual-cognitive lens was subsequently applied in the sport domain (MacIntyre et al., 2013). Two interlinked events led researchers to become enthusiastic in their study of visual cognition and sport (Williams and Ford, 2007). Firstly, the emergence of the expert performance approach (Ericsson and Smith, 1991) and later, the theory of deliberate practice (Ericsson et al., 1993), both provided an impetus for investigations into perceptual-cognitive skills, such as anticipation and decision-making in sport. The tenet that sport could be a dynamic natural laboratory was well made (Moran, 1996; Williams and Ericsson, 2005) and the development of innovative methodologies occurred in parallel (e.g., eye-tracking as a measure of attention). A burgeoning literature developed and sport as a domain of study gained popularity as a result (Moran, 2009; MacIntyre et al., 2013).

However, there were limits to this approach, particularly in the focus on visual-cognitive expertise, which arguably was to the detriment of our understanding of the underlying psychological processes. Take, for example, the quiet eye phenomenon which has recently gained prominence in sport science research (Vine et al., 2014). Increasingly, this is becoming a topic of interest within both cognitive psychology (Klostermann et al., 2013) and neuroscience (Vine et al., 2011). The quiet eye is defined as “a final fixation or tracking gaze that is located on a specific location or object in the visuomotor workspace within 3° of visual angle (or less) for a minimum of 100 ms” (Vickers, 2007, p. 11) prior to the onset of a critical movement. According to Vickers, quiet eye offset occurs when the gaze deviates off a specific location for more than 100 ms (Vickers, 2007, p. 11). Despite the success in establishing a quiet eye phenomenon “there has been a lack of explicit tests of the processes through which quiet eye training interventions exert their positive effect” (Vine et al., 2014, p. S237). To date, little knowledge of the psychological basis of the quiet eye phenomenon has emerged (Moran, 2012a). Similarly, while a wealth of knowledge has accumulated on the characteristics of individuals’ saccadic pursuit during visual attention tasks (Williams and Ford, 2007), little evidence exists to support the trainability of visual search (Mann et al., 2007).

A further limitation to the expertise approach is that, for example, the focus has been on a narrow set of conclusions from the original publication on deliberate practice (Ericsson et al., 1993). Therefore, it is not surprising that the debate over the contribution of deliberate practice to expert performance continues in chess (Campitelli and Gobet, 2011; Detterman, 2014), sporting expertise (Williams and Ford, 2007; Baker and Young, 2014) and professional expertise (Ericsson, 2009; Hoffman, 2014). Disagreements over the number of hours accumulated, starting age, and the link to general cognitive abilities continue to dominate the field (e.g., Gobet and Campitelli, 2007; Baker and Young, 2014; Hambrick et al., 2014a). For example, Hambrick et al. (2014b, p. 113) concluded that evidence had accumulated to suggest that, although relevant, deliberate practice, in itself, “does not largely account for individual differences in performance.” One caveat to be considered here is that these authors were concerned with the predictive ability of the theory solely within the context of chess. The acquisition of motor skills in the traditional sporting context is arguably more complex (Voss et al., 2010). For example, even defining deliberate practice among athletes is more challenging than with chess grandmasters (MacIntyre et al., 2013; Healy et al., 2014). Nevertheless, the conclusion by Hambrick et al. (2014b, p. 114) that “the question now is what else matters” suggests that we should consider a broader range of constructs in order to more comprehensively understand expertise.

Before we consider the construct of metacognition, the rationale for studying athletes and sport performers must be made readily apparent. Numerous authors have highlighted the role in which sport can provide a natural laboratory for the study of constructs within psychology and expertise (Ericsson and Smith, 1991; Moran, 1996; MacIntyre et al., 2013). According to Ericsson (2009, p. 18) “performance can be publically observed and even objectively measured in open competition and public performances.” Similarly, it has been noted that the high performance sport environment is dynamic. For example, typically performers have to execute complex skills under conditions of extreme stress where their limits are being constantly challenged (Baker and Young, 2014). Among the topics that have only recently received scrutiny are the role of attention and the allocation of effort in deliberate practice (Baker and Young, 2014). One explanation for this is that researchers concentrated on the variables that were most measurable, including the quantification of hours in practice (Helsen et al., 1998). A challenge for researchers has been reconciling the automaticity and procedural knowledge, central to expert sport performance, with the notion that declarative knowledge and metacognitive abilities may also play a role in the acquisition of expertise (Stanley and Krakauer, 2013; Toner, 2014). To explain, while procedural knowledge is inherently linked to optimum sport performance, declarative knowledge may have both a debilitative (Beilock and Carr, 2001) and facilitative role (Carson and Collins, 2011; MacIntyre et al., 2013; Brick et al., 2014). For example, it is probable that Carl Lewis knew his precise stride count to enable him to hit the board and take off into the sandpit at the 1984 Olympic Games. Thus, expertise in sports goes beyond mere procedural knowledge and arguably metacognitive processes are present at all stages of the target skill and may work in parallel. We thus propose an integrative model of expertise in sports, one that explores action and cognition in sport, a topic that has arguably only recently returned to the forefront of psychology.

In Rosenbaum (2005) suggested that researchers in psychology have historically turned relatively late to cognition and action. While this point is debatable, given the recent emergence of research on exceptional performance states (e.g., Choking; Beilock and Carr, 2001), the paucity of research on action in prior decades may be worthy of review. Understanding movement had long been the preserve of the fields of motor control, biomechanics, and neurophysiology perhaps due to the complexity of the cognition-action nexus and the lack of clear methodological approaches within psychology (Rosenbaum, 2005).“Thinking and action seem to lie at opposite ends of the behavioral spectrum” (Moran, 2012b, p. 1). The disembodied approach of information processing theorists in the 1970s led scientists to conduct research on thinking independently from the study of sensorimotor processes and mechanisms (Laakso, 2011). It was not until the advent of the motor cognition paradigm (Jeannerod, 1994) that “action” became subject to intensive scrutiny by researchers in psychology (MacIntyre et al., 2013). Jeannerod proposed that action, rather than movement per se, was vital to understand, as evidence for the role of cognition in movement planning was accumulating. The interest in understanding action from different perspectives was increasing rapidly (see Guillot and Collet, 2010). According to Moran (2009) importance of inter-disciplinary collaboration between researchers in cognitive sport psychology, cognitive psychology, and cognitive neuroscience has been brought to the fore by this new paradigm. Similarly, social cognition has developed as a field of study which has added considerably to our understanding of action (Gallese et al., 2004; Frith, 2012). And recently, cognitive researchers have embraced the study of the domain of sport in their quest to understand how the mind works (MacIntyre et al., 2013). Consequently, we propose that metacognition, a construct that is central to motor cognition, social cognition and action, can augment our current explanations and understanding of the preparation and execution of motor skills within the sport context and elucidate our conceptions of expertise.

What is Metacognition?

Metacognition, or “knowledge or cognition about cognitive phenomena” (Flavell, 1979, p. 906) is curiously under-explored in the domain of expertise among sports performers (Moran, 1996; MacIntyre and Moran, 2010). Elite athletes are not just experts in movement execution but conceivably they are also experts in planning, metacognition, and reflection. Metacognition has been defined as an individual’s insight into and control over their own mental processes (Flavell, 1979). In the decades since Flavell’s (1979) pioneering article, the term metacognition has been operationalized as the scientific study of the mind’s ability to monitor and control itself or, in other words, the study of our ability to know about our knowing (Van Overschelde, 2008, p. 47). It is a different kind of cognition as explained by Nelson (1999, p. 625): “If one aspect of cognition is monitoring or controlling another aspect of cognition, then the former aspect is metacognitive in relation to the latter aspect. Flavell and subsequent investigators have suggested a tripartite model of metacognition, with knowledge, control and monitoring components (Flavell, 1979, 1987; Tarricone, 2011; Halpern, 2014). Recently, Tarricone (2011) indicated that the main interaction between metacognition and self-regulation is to control, monitor, and regulate strategies to meet task demands and goals. Previously, the study of metacognition has targeted intellectual skills and a substantial corpus of research exists on metacognition in educational settings (Hacker et al., 2009). However, Augustyn and Rosenbaum (2005, p. 911) recently challenged the status quo in metacognition research and stated that “if intellectual and perceptual-motor skills rely on similar mechanisms, one would expect metacognition to apply to the guidance of perceptual-motor skills, just as it does to the guidance of intellectual skills.” The approach among cognitive neuroscientists, focused on visual perceptual tasks to measure metacognition (Palmer et al., 2013; Weil et al., 2013), is similarly narrow, perhaps due to methodological issues. Metacognition and action, on the other hand, offers new possibilities in illuminating our understanding of expertise and action.

Expertise and Metacognition

Expertise is tightly coupled with metacognition in both training (e.g., knowledge of when a skill has been acquired) and competitive settings (e.g., self-regulation under stress). We propose that metacognitive processes are inherently related to expertise in sports and we have summarized recent findings in the sport literature that reflect the prominence of metacognitive explanations (see Table 1). Early investigations were focused on judgments of learning (Simon and Bjork, 2001) and more recently more specificity in the research questions has led to the development of specific models (MacIntyre and Moran, 2010). In the coming sections, we postulate that people use different sources of information, including metacognitive inferences. Firstly, we contend that expertise in any given area facilitates metacognitive inference and secondly, that expertise itself may consist of metacognitive inference, among a range of other non-metacognitive processes including working memory and motivation. Given that expertise is explained by differences in knowledge, many processes involving the use of that knowledge are more or less automatic or procedularized, and consequently they do may not place onerous demands on working memory (Beilock and Carr, 2001). This creates the opportunity for metacognitive reasoning to optimize the assessment of situations and to structure one’s goal pursuit. Furthermore, experts have quite good ideas about standards and deviations from such standards, whether this refers to one’s own behavior or to the behavior of others. Deviations from sophisticated mental models (e.g., the ideal long jump) are thus more likely to become salient to experts than to non-experts, also providing opportunities for reflective thoughts and interventions. The use of both action simulations (e.g., mental practice) and pre-performance routines by elite performers can be conceptualized as domain-general strategies which rely upon metacognitive processes. Evidence to support these contentions will be presented in the forthcoming sections.

TABLE 1
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TABLE 1. Recent research in sport that has highlighted the role of metacognition.

The Role of Metacognitive Inferences

The Coliseum, Los Angeles, XXIII Olympic Games, August 8th 1984. A strong wind was swirling around the stadium in the afternoon as Carl Lewis’s was preparing for his long jump (50 stunning Olympic moments No. 44: Carl Lewis’s four golds in 1984, 2012). ABC network commentators were referring to Carl Lewis’ adjustments: “He has to block that out and has to only think about heading down the runway and getting off as long a jump as possible.” The other reporter then stated: “He has got a bit of a headwind. I think that’s what he was waiting for… to decide what he is going to do with his step with regard to this wind.” Carl Lewis ran down the runway and leapt into the history books with a jump that at that stage was 50 cm greater than his rivals. Nevertheless, the commentators stated that it “looked like a very restrained effort to me, the last four or five strides… he really looked like he was sort of in that same stride that he was running in the last 50 m of the 200 this morning [200 m heats]” (Corry, 1984).

After fouling his next jump, Lewis decided not to take his four other allotted jumps and many of the crowd responded by booing despite the margin of victory ultimately being 30 cm (Corry, 1984). Many of the spectators plausibly wanted him to break Bob Beamon’s longstanding world record. However, Lewis’ rationale was that he had other goals to achieve (e.g., to equal Jesse Owens four track and field gold medals in 1936) and he still had his additional rounds to run in the 200 and 100 m relay. Given that Carl Lewis won four gold medals, just as Jessie Owens had, we can conclude that his strategies were successful. Both, the execution of the final jump, in addition to his decision to rest, indicate metacognitive inferences in addition to his athletic expertise.

When individuals perform skills in the sporting context the social situation provides many pieces of information. For example, when Carl Lewis is about to perform a long jump, he may remember his coach’s words about his holding back on his speed both to hit the board accurately and to preserve energy. As he looks down the runway and notices that it is somewhat slippery, and is unsure whether his left foot will begin to ache again, just as it did 30 years ago he is metacognitively engaged. There may be even much more metacognitive activity occurring than the aforementioned examples may suggest. The cognitive system is challenged with the amount of information that is accessible at a given time and the implications that these pieces of information may have for the execution of skill need to be considered. For optimum adjustments, people need to be attuned to thoughts and feelings about the self and the requirements of the social situation. Yet, given that most social situations provide a tremendous amount of information, people need to be able to focus, that is, they need to be selective. So, when it comes to particular tasks such as a long jump, people need to select “what is relevant” and ignore “what is not relevant” for the task at hand. How does this work?

A model of metacognition

Bless et al. (2009) proposed a model of metacognition that focuses on different information types. Specifically, cognitively accessible declarative knowledge (i.e., knowledge about something) and feelings (e.g., how people feel about an action) and memories (e.g., whether they can remember a coach’s instruction) serve as information about the situation and the target in question. This has particular resonance when people are uncertain about the judgmental target or when affective states are not in line with implications of the situation, then metacognitive processes are more likely to come into play (e.g., Martin et al., 1993; Bless et al., 2009). Metacognitive inferences are governed by rules or theories that decide whether the accessible information should be used and how it should be used in the moment.

When an expert judges performance, this may access a representation about the target behavior (e.g., a motor image). For example, imagine Carl Lewis watching his 1984 long jumps at the Olympic Games. A vast amount of information about long jumps, such as Bob Beamon’s Leap of the Century at the Olympic Games in Mexico City in 1968, and his own jump might be cognitively accessible at the time. Which pieces of information are relevant? People apply filtering rules, considering whether the information is relevant and representative for the target behavior (e.g., Martin, 1986; Bless et al., 2009). Information might just as easily become accessible in a conversation and thus comprise declarative information. Declarative knowledge is defined as “knowing that” (e.g., taping factual information) and contrasts with procedural knowledge, or skill memory, which is explained as “knowing how” (Sternberg and Sternberg, 2012). For example, Carl Lewis might have a chat with Bob Beamon and Mike Powell about his 1984 long jump performance. If information becomes accessible as part of conversations, the person also needs to ask him or herself whether the information is appropriate to be used for a judgment or decision. Here conversational rules as outlined seem to guide decisions on relevance and informativeness of communicated information (e.g., Schwarz, 1994; Igou and Bless, 2003, 2005, 2007; Bless et al., 2009). Furthermore, metacognitions may relate to past or future affective states. These are thoughts that include many different sources of information (e.g., Wilson and Gilbert, 2003; Igou, 2004, 2008) and assessments of the past or forecasts of future affective states are likely to influence one’s behavior (Kahneman and Snell, 1992). For example, a long jumper may know that he has felt good being in competitions and thus decides to take part in one that is coming up in 2 weeks time.

Another important type of information and likely source of metacognitive processes are people’s feelings at the time of judgments or behavior. For example, a long jumper’s mood, emotion, or the ease with which information comes to mind, may influence the execution of the long jump. Importantly, these feelings have informational value (e.g., Schwarz, 2002) for the judgment or behavior at hand. Usually, affective feelings are distinguished from cognitive feelings (Bless et al., 2009). Moods and emotions are considered affective feelings, and they can inform us about the situation and the target (e.g., Schwarz, 1990). For example, according to Schwarz and Clore (1983), when asked to judge a target (e.g., life in general), people ask themselves “How do I feel about it?” which leads to positive evaluations when people are in a positive mood, and to negative evaluation when they are in a negative mood (e.g., Forgas, 2001).

The feeling of knowing (e.g., Koriat, 1993), ease of retrieval (e.g., Schwarz et al., 1991), familiarity (e.g., Jacoby et al., 1989), and processing fluency (e.g., Reber et al., 1998) are examples of cognitive feelings (e.g., Bless et al., 2009; Huntsinger and Clore, 2011). In a nutshell, these are all experiences that accompany cognitive processes and interact with these processes by serving as information about judgmental targets. For example, according to the ease of retrieval heuristic (Schwarz et al., 1991), if it is easy to think of having performed long jumps, then one would be likely to evaluate one’s jumping capacity more favorably, than if it was difficult to retrieve such examples.

Memories have direct effects on how cognitive representations are formed. However, congruent with Strack and Bless (1994) and Bless et al. (2009), we argue that people also use theories about the functioning of memory as an indicator as to whether accessible information is valid and relevant for a judgment at hand. For example, Carl Lewis may not remember that the coach warned him to run within himself for the long jump run-up. Possibly, Carl would reason that he would remember that because it would have been very untypical for his coach to hold this opinion.

Our conceptualization of metacognition is in line with a broad definition of the construct, namely that metacognition is cognition about both thoughts and feelings. However, the narrower definition of metacognition as control process (e.g., Shea et al., 2014) is also just as valid. The latter refers to processes in which attention and cognitive control are essential in structuring peoples’ thoughts and actions. As Shea et al. (2014) describe in detail, these types of thoughts are associated with cognitive effort and limited capacity (cognitive system 2) rather than automatic, effortless processes (cognitive system 1; Stanovich, 2011).

Generally, monitoring and excluding accessible items of information requires cognitive resources. As a result, reduction in cognitive capacity increases the likelihood that relatively irrelevant information is used for the judgment task at hand (Bless et al., 2009). To be clear, we do not think that metacognitions always need awareness and controlled thought processes; however, we believe that metacognitive inferences are especially influential when people need to engage in this type of reflective behavior in order make a judgment or decision. This is especially the case when situations are ambiguous and complex, when more or less automatic processes fail, or when accessible information is conflicting, contradictory, or perceived as inappropriate for the task at hand.

PST and Metacognition: The Case for Domain-General Skills

Interestingly, the ability of Carl Lewis to combine excellence in both track (e.g., 100, 200 m sprints and relay) and field events (e.g., long jump) supports the domain-specificity of expertise. To explain, long jump performance is determined largely by the athlete’s ability to attain a fast horizontal speed at the end of the approach runway, thus the physiological task demands were compatible (Bridgett and Linthorne, 2006). However, it is also likely that what are termed “domain-general skills” including psychological skills and metacognition may have played a role in his nine Olympic gold medal winning performances.

As noted earlier (see Table 1), Foster and Weigand (2008) highlighted that some theoretical inadequacies in sport psychology could be reconciled by considering other conceptual frameworks, including meta-cognitive approaches (Flavell, 1979). For example, by augmenting our understanding of psychological skills in sport with the construct of metacognition, we could more clearly understand the role of self-monitoring and self-regulation in the application of the aforementioned strategies.

Moran (1996) suggested that PST in sport is essentially an exercise in meta-cognitive instruction. Thus, in order to help athletes become independent thinkers, we need to know what they know and believe about how their own minds work. In this regard, meta-cognitive control processes are especially valuable because they allow people to change their behavior strategically in accordance with task demands. Eccles and Feltovich (2008) proposed that accelerated learning and enhanced performance, and ultimately expertise, may be the result of a combination of psychological support skills (e.g., self-talk, goal-setting, relaxation, and mental practice) and metacognitive abilities. They are domain-general in that they “can be applied to a variety of novel tasks and domains” (Eccles and Feltovich, 2008, p. 43). Meta-cognitive skills in this case are higher order skills that regulate learning and performance, including the coordination of the use of psychological support skills (i.e., PST).

Within sport psychology, psychological skills have been shown to differentiate successful Olympians from their less successful counterparts (Orlick and Partington, 1988; Gould et al., 2002; Fletcher and Sarkar, 2012). The coordinating role of metacognition may be a key factor in the efficient use of psychological skills. Furthermore, emotional regulation is trainable and sustainable by the application of PST and this has applications beyond the realm of sport (Eccles et al., 2011). Two other aspects of psychological skills that are indeed trainable are now discussed, meta-imagery and routines.

Is meta-imagery linked to expertise?

One dimension of metacognition that has been illuminated by recent research activity is “meta-imagery,” a performer “beliefs about the nature and regulation of their own imagery skills” (Moran, 2002, p. 415). In 2002, little was known about this topic relative to the knowledge base on other aspects of imagery, such as motor imagery. Over the preceding years research in the expertise literature emerged to suggest that meta-imagery is another factor that differentiates novices from experts (Moran et al., 2012). Researchers had explored the topic by asking athletes to indicate why, where, how, what, and when they use mental imagery processes (e.g., Munroe et al., 2000; MacIntyre and Moran, 2007a,b). Athletes’ responses from both interviews and surveys demonstrated a comprehensive knowledge of the multi-modal potential of imagery, showed they employed imagery in creative ways for contingency planning (see Moran, 2009) and were also aware of robust imagery effects (e.g., mental practice). Interestingly, a meta-analysis conducted in 1994, indicated a possible constraint on the efficacy of mental practice for novice learners (i.e., experts improved more). Driskell et al. (1994) suggested that novices may not have an appropriate approximation of the motor skill or that their imagery abilities may be insufficient to generate and manipulate the requisite visuo-spatial motor configuration. An alternative possibility is that experts may simply possess greater meta-cognitive knowledge of how to employ imagery effectively for skill improvement as compared to novices (MacIntyre et al., 2013). In fact, a model of meta-imagery was developed to account for the above findings and this also generates possibilities of developing a test of meta-imagery (MacIntyre and Moran, 2010).

Furthermore, contemporary evidence from cognitive psychology supports the role of meta-cognitive knowledge of imagery ability and relates it to our ability to judge individual episodes of imagery (Pearson et al., 2011). The voluntary nature of imagery and the role of conscious awareness during imagery tasks make it amenable to introspection, ironically the method that was central to the demise of the scientific study of imagery, a century ago (Roeckelein, 2004).

Is winning just a matter of routine?

Pre-performance routines are integral to performance excellence in many self-paced sporting skills, from sprint running to penalty taking in field games (Singer, 2000, 2002; Jackson and Baker, 2001). Defined by Moran (1996, p. 177) as “a sequence of task-relevant thoughts and actions which an athlete engages in systematically prior to his or her performance of a specific sports skill.” The widespread use of routines in sport demonstrates that attention is central to cognitive sport psychology because the ability to exert mental effort effectively is vital for optimal athletic performance (Moran, 2009). One function of routines is to regulate arousal prior to skill execution and evidence for their role in buffering stress or choking has also emerged (Mesagno and Mullane-Grant, 2010). While routines have been explored across a range of sports, perhaps, the sport of golf has received the most attention from researchers (e.g., McCann et al., 2001; Cotterill et al., 2010). Interestingly, three time major winner golfer Padraig Harrington is quoted as saying “my key isn’t working at the moment so we have to figure out a way… I have gone a bit stale focusing on the target.” What is instructive about this statement is that the golfer appears to realize that his routine is no longer functioning appropriately. Routines need to be revised regularly to avoid the routine itself becoming too automatic (Moran, 1996). From a metacognitive perspective, this may be accounted for by metacognitive monitoring. Thus metacognition may be fundamental to the refinement of pre-performance routines as well as their acquisition. A recent review noted that “at a fundamental level it is still not clear what function routines fulfill, what they should consist of or the most effective way to teach them” (Cotterill, 2010, p. 132). The potential for metacogniton research to shed light on the development and refinement of routines as well as their theoretical and conceptual basis is readily apparent.

New Avenues for Future Research

In the preceding paragraphs, arguments for the potential for the construct of metacognition to clarify our understanding of expertise have been made. Now we wish to specify research topics augmented by appropriate methodologies and possible tasks (see Table 2).

TABLE 2
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TABLE 2. Proposed research topics, methods, and objectives of future studies to study expertise and metacognition in sport settings.

Measurement

One of the key challenges in the operationalization of any construct is the development of appropriate measurement tools. At present, there is a paucity of questionnaires to assess metacognitive abilities. One such measure is the 52-item Metacognitive Awareness Inventory (Schraw and Dennison, 1994) which employs a two factor model (knowledge of cognition; regulation of cognition). Currently, there is a need to develop and validate revised psychometric instruments to assess, for example, meta-imagery beliefs and knowledge. Further questionnaires for meta-attention or social metacognition (for team sports) could also be piloted, refined and analyzed using factor analysis. Parallel with the objective would be the refinement of the construct of metacognition as it relates to both expertises. Tarricone (2011) had conducted a comprehensive “taxonomy of metacognition” which is primarily focused upon on the wide-scale research in the educational research domain. A similar task would be beneficial for metacognition within the context of expertise and the models discussed in this review (e.g., Bless et al., 2009). The approach of Fleming and Lau (2014, p. 1) who distinguish between “metacognitive bias (a difference in subjective confidence despite basic task performance remaining constant), metacognitive sensitivity (how good one is at distinguishing between one’s own correct and incorrect judgments) and metacognitive efficiency (a subject’s level of metacognitive sensitivity given a certain level of task performance)” raises interesting questions for the study of metacognition and conscious awareness. Their approach, focusing on perceptual expertise, includes elements which have a direct relevance to expert performance. For instance, they suggest that “metacognitive confidence” can be interpreted as a probability judgment directed toward one’s own decisions-the probability of a previous judgment being correct. This is synonymous with expertise (i.e., ability to predict actions). It is our view that the exploration of the construct of metacognition and how they interface with action related processes (e.g., motor imagery), we can contribute to the conceptual development of the construct of metacognition. The divergent approaches to date necessitate a degree of conceptual analysis, a process that is all too rare in psychology (Machado and Silva, 2007).

Motor cognition

Recent conceptualizations of imagery, action observation and motor execution, view these processes as overlapping, differing by degree rather than kind (Jeannerod, 1994, 2006; Vogt et al., 2013). The preceding section on meta-imagery is illustrative of the progress that can be made in our understanding of expertise, metacognition and imagery, alike. Given the overlap between for example, imagery (e.g., visualizing a long jump-the run-up, take-off, and landing phases) and action observation (e.g., viewing Bob Beamons’ world record long jump), a question arises as to whether the same metacognitive processes underlie these related processes. This issue is further complicated by evidence from several sources which suggests motor imagery is grounded in physical experience, for example, the specific training either simulated or executed (Olson and Nyberg, 2011; Debarnot et al., 2014). The question remains as to whether the respective metacognitive processes are domain-general or domain-specific? As a result, deeper conceptual analysis is required to comprehensively describe and explain the range of metacognitive processes that pertain to cognitive simulation strategies. This new dimension to metacognition research offers a range of experimental possibilities that can enable a greater understanding of metacognition with regard to action preparation, simulation, and execution.

Anxiety

Research on “choking” in sport has illuminated our understanding of anxiety across both cognitive skills (e.g., Lyons and Beilock, 2012) and motor skill contexts (e.g., Beilock and Carr, 2001; Beilock and Gonso, 2008; DeCaro et al., 2011; Toner and Moran, 2011; Toner et al., 2013). The “explicit monitoring hypothesis” suggests that attending to a well learned skill may lead to failure in the precise execution of the skill under pressure. Metacognitive abilities obviously have a role in regulation emotion, based on the aforementioned model by Bless et al. (2009). Furthermore, the role of “stereotype threat” which occurs when “knowledge of a negative stereotype about a social group leads to a les-than-optimal performance by members of that group” should be investigated from a metacognitive perspective (Beilock and McConnell, 2004). Previous investigations supported the contention that stereotype threat prompts attention to the executed action and thus can disrupt performance (Beilock et al., 2003). However, this effect can be alleviated by the inclusion of a secondary task. Findings across two studies conducted by Beilock et al. (2003) were inconsistent and the impact of stereotype threat may be more telling across a tournament than a putting skill as it may interfere with the metacognitive processes that help modulate attention and regulate emotion. Another avenue is to systematically examine how current affect and anticipated affective responses to performance influence action in sports via meta-cognitive thoughts. This is based on the recent literature on affect regulation (e.g., Baumeister et al., 2007; Loewenstein, 2011) Moreover, it would be interesting to investigate how training in metacognition can influence skilled performance and athletes’ susceptibility to overcompensation of attention and affect regulation.

Neuroscience

The rise of neuroscience in recent decades has been based largely upon advances in methodologies that facilitate the study of internal mental experiences, such as metacognition, in a robust and scientific way. Cognitive neuroscience, in particular, has had a dramatic effect on our understanding of individual domains of cognition from vision to memory (Beran et al., 2012), in chess (Bilalic et al., 2010, 2012; Bartlett et al., 2013) and more recently in sport (Debarnot et al., 2014). As we have seen throughout the current paper sport and athletic skills offer a dynamic and fascinating arena to study and explore cognitive processes, metacognitive processes, and experiences.

Regarding expertise, we saw that in order to engage in effective training episodes for long periods of time, athletes must be highly self-disciplined and self-regulated (Crews et al., 2001). This notion of self-regulation, defined as a set of cognitive, behavioral, and motivational processes that interact to influence performance (Kitsantas and Kavussanu, 2011) has been the go-to approach for examining expertise differences in performance domains. This approach has been concerned with self-regulatory processes (imagery, attentional control, for example) and researchers typically attempted to make confidence judgments about the efficacy of some aspect of their cognition. Neuroscience has enabled researchers to move beyond the study of processes and focus on metacognitive judgments instead (a case in point being; the feeling of inaccessibility otherwise known as the tip of the tongue phenomena). This temporary failure of retrieval for a memory highlights a problem with a particular cognitive process but not a problem with one’s metacognitive judgment. What tip of the tongue research has shown us is that different underlying processes are responsible for the cognition and metacognition that monitors it (Schwartz and Diaz, 2014). Metacognitive experiences arise from cognitive processes and correspond to particular behaviors. The cognitive processes that produced the behavior are not the same as the processes that gave rise to the metacognition. For example, an object is recognized as having been seen before (cognitive process) accompanied by an experience of confidence, and the person then says that they know the answer (behavior). Essentially, there are a set of cognitive processes driving the recall of information but another set of processes driving our awareness of it. “Thus understanding any metacognitive judgment must involve understanding the cognition it measures and the multiple processes that contribute to the judgment” (Schwartz and Diaz, 2014, p. 9). Attempts at componential analysis of metacognition are in their infancy (Fleming and Lau, 2014; Garrison, 2014), but they appear to be fruitful with regard to understanding its impact upon visual perceptual tasks. Nevertheless, the investigation of the neural basis of metacognition (Baird et al., 2013) is not without its limitations. It has been noted that the application of neurophysiological measurement techniques impose restrictions on the ecological validity of studies which are not readily overcome (Mann et al., 2013).

Developmental

Currently, a gap exists in our knowledge of how performers acquire pre-performance routines (Singer, 2000, 2002; Cotterill, 2010). Unfortunately, researchers have neglected to explore how these strategies are developed over time with one recent notable exception, a study with gymnastics athletes (Faggiani et al., 2012). The role of cognitive development in the acquisition of meta-cognitive skills may be a limiting factor for applied sport psychology interventions (Foster and Weigand, 2008). Thus the gap in the knowledge base may be due to the complex interaction of domain-general and domain-specific cognitive skills. Given that our approach has centered on the role of metacognitive abilities and processes, we propose that a developmental approach to understanding pre-performance routines could be augmented by exploring metacognitive skill development from a longitudinal perspective. The potential of specific interventions to enhance metacognitive ability could be explored for those who are impaired in their metacognitive development or for those who suffer plateaus in their skill development. For example, recent research has demonstrated the ability of a 2-week meditation program in enhancing metacognitive ability in a perceptual task (Baird et al., 2014).

Conclusion

Do metacognitive processes enhance performance? Are they helpful in the acquisition of expertise? The general answer to these questions is in the affirmative. Metacognitive processes are part of the inventory of human thought (Nelson and Narens, 1994; Sternberg, 2001; Perfect and Schwartz, 2002). As such, they serve as a resource to structure thought and regulate behavior. Will metacognitive processes always lead to better outcomes? No, certainly not. As for all areas of information processing, people can err. However, understanding the role of metacognition, the breadth and flexibility of processes involved and how they are associated with expertise, allows for more precise predictions of behavior.

We argue that more research and empirical scrutiny of the construct of metacognition can help to develop principles that govern the relation between internal cognitive processes and subjective experience. These principles could be very effective for expertise research looking to differentiate a “real” expert from a “skilled” performer, currently a major challenge in expertise research (e.g., MacIntyre et al., 2013; Bourne et al., 2014).

In the sporting domain, training athletes to initiate, develop and engage in metacognition can equip them with the proper strategies, beliefs, and self-understanding to excel in sports. Currently, there is no unified view as to what athletic training entails and coaches, despite a burgeoning literature (Healy et al., 2014) have, for example, focused on a relatively narrow set of conclusions from the deliberate practice literature (Baker and Young, 2014). Metacognition offers the potential to expand our understanding of expertise and individual domains of cognition through a rigorous examination of the mechanisms underlying self-initiated monitoring and control of ones own performance. Consequently, our understanding of expertise can be illuminated by studying metacognition in the sporting, domain, specifically, by using a strength-based approach with expert samples (MacIntyre et al., 2013). Sport offers researchers a fertile natural laboratory where expertise is easily quantifiable through the quest to be faster, higher and stronger. In conclusion, we have demonstrated that the construct of metacognition has the potential to be a springboard for research into sporting expertise.

Conflict of Interest Statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Acknowledgments

This work was supported jointly by the Irish Research Council under their ‘New Foundations’ scheme and the Department of Physical Education and Sport Science, University of Limerick ‘Start-Up’ grant scheme awards to the first author. We wish to acknowledge the efforts of the three reviewers and editorial team in refining our ideas and assisting us in creating a clearer narrative.

References

50 stunning Olympic moments No. 44: Carl Lewis’s four golds in 1984. (2012). The Guardian. Available at: http://www.theguardian.com [accessed June 29, 2012].

Augustyn, J. S., and Rosenbaum, D. A. (2005). Metacognitive control of action: preparation for aiming reflects knowledge of Fitts’ law. Psychon. Bull. Rev. 12, 911–916. doi: 10.3758/BF03196785

CrossRef Full Text | Google Scholar

Baird, B., Mrazek, M. D., Phillips, D. T., and Schooler, J. W. (2014). Domain-specific enhancement of metacognitive ability following meditation raining. J. Exp. Psychol. Gen. 143, 1972–1979. doi: 10.1037/a0036882

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Baird, B., Smallwood, J., Gorgolewski, K. J., and Margulies, D. S. (2013). Medial and lateral networks in anterior prefrontal cortex support metacognitive ability for memory and perception. J. Neurosci. 33, 16657–16665. doi: 10.1523/JNEUROSCI.0786-13.2013

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Baker, J., and Young, B. (2014). 20 years later: deliberate practice and the development of expertise in sport. Int. Rev. Sport Exerc. Psychol. 135–157. doi: 10.1080/1750984x.2014.896024

CrossRef Full Text | Google Scholar

Bartlett, J. C., Boggan, A. L., and Krawczyk, D. C. (2013). Expertise and processing distorted structure in chess. Front. Hum. Neurosci. 7:825. doi: 10.3389/fnhum.2013.00825

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Baumeister, R. F., Zell, A. L., and Tice, D. M. (2007). “How emotions facilitate and impair self-regulation,” in Handbook of Emotion Regulation, ed. J. J. Gross (New York, NY: Guilford Press), 408–428.

Google Scholar

Beilock, S. L., and Carr, T. H. (2001). On the fragility of skilled performance: what governs choking under pressure? J. Exp. Psychol. Gen. 130, 701–725. doi: 10.1037/0096-3445.130.4.701

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Beilock, S. L., and Gonso, S. (2008). Putting in the mind versus putting on the green: expertise, performance time, and the linking of imagery and action. Q. J. Exp. Psychol. 61, 920–932. doi: 10.1080/17470210701625626

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Beilock, S. L., Jellison, W. A., McConnell, A. R., and Carr, T. H. (2003). When negative stereotypes lead to negative performance outcomes: understanding the stereotype threat phenomenon in sensorimotor skill execution. Paper presented at the North American Society for the Psychology of Sport and Physical Activity. Savannah, GA.

Google Scholar

Beilock, S. L., and McConnell, A. R. (2004). Stereotype threat and sport: can athletic performance be threatened? J. Sport Exerc. Psychol. 26, 597–609.

Google Scholar

Beran, M. J., Brandl, J., Perner, J., and Proust, J. (eds). (2012). Foundations of Metacognition. Oxford: Oxford University Press. doi: 10.1093/acprof:oso/9780199646739.001.0001

CrossRef Full Text | Google Scholar

Bilalic, M., Langner, R., Erb, M., and Grodd, W. (2010). Mechanisms and neural basis of object and pattern recognition: a study with chess experts. J. Exp. Psychol. Gen. 139, 728–742. doi: 10.1037/a0020756

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Bilalic, M., Turella, L., Campitelli, G., Erb, M., and Grodd, W. (2012). Expertise modulates the neural basis of context dependent recognition of objects and their relations. Hum. Brain Mapp. 33, 2728–2740. doi: 10.1002/hbm.21396

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Bless, H., Keller, J., and Igou, E. R. (2009). “Metacognition,” in Social Cognition, the Basis of Human Interaction. Frontiers of Social Psychology, eds J. Förster and F. Strack (New York: Psychology Press), 157–178.

Google Scholar

Bourne, L. E., Kole, J. A., and Healy, A. F. (2014). Expertise: defined, described, explained. Front. Psychol. 5:186. doi: 10.3389/fpsyg.2014.00186

CrossRef Full Text | Google Scholar

Brick, N., Mac Intyre, T., and Campbell, M. (2014). Attentional focus in endurance activity: new paradigms and future directions. Int. Rev. Sport Exerc. Psychol. 7, 106–134. doi: 10.1080/1750984X.2014.885554

CrossRef Full Text | Google Scholar

Bridgett, L. A., and Linthorne, N. P. (2006). Changes in long jump take-off technique with increasing run-up speed. J. Sports Sci. 24, 889–897. doi: 10.1080/02640410500298040

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Campitelli, G., and Gobet, F. (2005). The mind’s eye in blindfold chess. Eur. J. Cogn. Psychol. 17, 23–45. doi: 10.1080/09541440340000349

CrossRef Full Text | Google Scholar

Campitelli, G., and Gobet, F. (2011). Deliberate practice: necessary but not sufficient. Curr. Dir. Psychol. Sci. 20, 280–285. doi: 10.1177/0963721411421922

CrossRef Full Text | Google Scholar

Carson, H. J., and Collins, D. (2011). Refining and regaining skills in fixation/diversification stage performers: the five-A model. Int. Rev. Sport Exerc. Psychol. 4, 146–167. doi: 10.1080/1750984X.2011.613682

CrossRef Full Text | Google Scholar

Chase, W. G., and Simon, H. A. (1973). “The mind’s eye in chess,” in Visual Information Processing, ed. W. G. Chase (New York: Academic Press), 215–272.

Google Scholar

Corry, J. (1984). TV review; ABC’S coverage of the Olympics. The New York Times, 11th February.

Cotterill, S. (2010). Pre-performance routines in sport: current understanding and future directions. Int. Rev. Sport Exerc. Psychol. 3, 132–153. doi: 10.1080/1750984X.2010.488269

CrossRef Full Text | Google Scholar

Cotterill, S. T., Sanders, R., and Collins, D. (2010). Developing effective pre-performance routines in Gglf: why don’t we ask the golfer? J. Appl. Sport Psychol. 22, 51–64. doi: 10.1080/10413200903403216

CrossRef Full Text | Google Scholar

Crews, D. J., Lochbaum, M. R., and Karoly, P. (2001). “Self-regulation: concepts, methods, and strategies in sport and exercise,” in Handbook of Sport Psychology, eds R. N. Singer, H. A. Hausenblas, and C. M. Janelle (New York: Wiley), 566–581.

Google Scholar

Debarnot, U., Sperduti, M., Di Rienzo, F., and Guillot, A. (2014). Experts bodies, experts minds: how physical and mental training shape the brain. Front. Hum. Neurosci. 8:280. doi: 10.3389/fnhum.2014.00280

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

DeCaro, M. S., Thomas, R. D., Albert, N. B., and Beilock, S. (2011). Choking under pressure: multiple routes to skill failure. J. Exp. Psychol. Gen. 140, 390–406. doi: 10.1037/a0023466

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

de Groot, A. D. (1965). Thought and Choice in Chess, 2nd Edn. The Hague: Mouton.

Google Scholar

Denis, M., and Carfantan, M. (1985). People’s knowledge about images. Cognition 20, 49–60. doi: 10.1016/0010-0277(85)90004-6

CrossRef Full Text | Google Scholar

Detterman, D. K. (2014). Introduction to the intelligence special issue on the development of expertise: is ability necessary? Intelligence 45, 1–5. doi: 10.1016/j.intell.2014.02.004

CrossRef Full Text | Google Scholar

Driskell, J. E., Copper, C., and Moran, A. (1994). Does mental practice enhance performance? J. Appl. Psychol. 79, 481–492. doi: 10.1037/0021-9010.79.4.481

CrossRef Full Text | Google Scholar

Eccles, D. W., and Feltovich, P. J. (2008). Implications of domain-general “psychological support skills” for transfer of skill and acquisition of expertise. Perform. Improv. Q. 21, 43–60. doi: 10.1002/piq.20014

CrossRef Full Text | Google Scholar

Eccles, D. W., Ward, P., Woodman, T., Janelle, C. M., Le Scanff, C., Ehrlinger, J.,et al. (2011). Human factors and sport psychology: advancing the science of human performance. Hum. Factors 53, 180–202. doi: 10.1177/0018720811403731

CrossRef Full Text

Ericsson, A. (2009). Development of Professional Expertise: Toward Measurement of Expert Performance and Design of Optimal Learning Environments. New York: Cambridge University Press. doi: 10.1017/CBO9780511609817

CrossRef Full Text | Google Scholar

Ericsson, K. A. (2006a). “An introduction to Cambridge handbook of expertise and expert performance: its development, organization, and content,” in Cambridge Handbook of Expertise and Expert Performance, eds K. A. Ericsson, N. Charness, P. Feltovich, and R. R. Hoffman (Cambridge: Cambridge University Press), 1–19. doi: 10.1017/CBO9780511816796

CrossRef Full Text | Google Scholar

Ericsson, K. A. (2006b). “The influence of experience and deliberate practice on the development of superior expert performance,” in Cambridge Handbook of Expertise and Expert Performance, eds K. A. Ericsson, N. Charness, P. Feltovich, and R. R. Hoffman (Cambridge: Cambridge University Press), 685–706.

Google Scholar

Ericsson, K. A. (2014). Why expert performance is special and cannot be extrapolated from studies of performance in the general population: a response to criticisms. Intelligence 45, 81–83. doi: 10.1016/j.intell.2013.12.001

CrossRef Full Text | Google Scholar

Ericsson, K. A., Krampe, R. T., and Tesch-Romer, C. (1993). The role of deliberate practice in the acquisition of expert performance. Psychol. Rev. 100, 363–406. doi: 10.1037/0033-295X.100.3.363

CrossRef Full Text | Google Scholar

Ericsson, K. A., and Smith, J. (1991). Toward a General Theory of Expertise: Prospects and Limits. New York: Cambridge University Press.

Google Scholar

Faggiani, F., McRobert, A. P., and Knowles, Z. (2012). Developing pre-performance routines for acrobatic gymnastics: a case study with a youth tumbling gymnast. Sci. Gymnast. J. 4, 39–52.

Google Scholar

Flavell, J. H. (1979). Metacognition and cognitive monitoring: a new area of cognitive-developmental inquiry. Am. Psychol. 34, 906–911. doi: 10.1037/0003-066X.34.10.906

CrossRef Full Text | Google Scholar

Flavell, J. H. (1987). “Speculations about the nature and development of metacognition,” in Metacognition, Motivation, and Understanding, eds F. E. Weinert and R. H. Kluwe (Hillsdale, NJ: Lawrence Erlbaum Associates), 21–29.

Google Scholar

Fleming, S. M., and Lau, H. C. (2014). How to measure metacognition. Front. Hum. Neurosci. 8:443. doi: 10.3389/fnhum.2014.00443

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Fletcher, D., and Sarkar, M. (2012). A grounded theory of psychological resilience in Olympic champions. Psychol. Sport Exerc. 13, 669–678. doi: 10.1016/j.psychsport.2012.04.007

CrossRef Full Text | Google Scholar

Forgas, J. P. (2001). “The affect infusion model (AIM): an integrative theory of mood effects on cognition and judgments,” in Theories of Mood and Cognition, eds L. L. Martin and G. L. Clore (Mahwah, NJ: Erlbaum), 99–134.

Google Scholar

Foster, D., and Weigand, D. (2008). The role of cognitive and metacognitive development in mental skills training. Sport Exerc. Psychol. Rev. 4, 21–29.

Google Scholar

Frith, C. D. (2012). The role of metacognition in human social interactions. Philos. Trans. R. Soc. B Biol. Sci. 367, 2213–2223. doi: 10.1098/rstb.2012.0123

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Gallese, V., Keysers, C., and Rizzollatti, G. (2004). A unifying view of the basis of social cognition. Trends Cogn. Sci. 8, 396–409. doi: 10.1016/j.tics.2004.07.002

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Garrison, J. (2014). Dissociable neural networks supporting metacognition for memory and perception. J. Neurosci. 34, 2765–2767. doi: 10.1523/JNEUROSCI.5232-13.2014

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Gladwell, M. (2008). Outliers: The Story of Success. New York: Little, Brown and Company.

Google Scholar

Gobet, F., and Campitelli, G. (2007). The role of domain-specific practice, handedness, and starting age in chess. Dev. Psychol. 43, 159–172. doi: 10.1037/00121649.43.1.159

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Gould, D., Dieffenbach, K., and Moffett, A. (2002). Psychological characteristics and their development in Olympic champions. J. Appl. Sport Psychol. 14, 172–204. doi: 10.1080/10413200290103482

CrossRef Full Text | Google Scholar

Guillot, A., and Collet, C. (2010). The Neurophysiological Foundations of Mental and Motor Imagery. Oxford: Oxford University Press. doi: 10.1093/acprof:oso/9780199546251.001.0001

CrossRef Full Text | Google Scholar

Hacker, D. J., Dunlosky, J., and Graesser, A. C. (2009). Handbook of Metacognition in Education. New York, NY: Routledge.

Google Scholar

Halpern, D. F. (2014). Thought and Knowledge: An Introduction to Critical Thinking, 5th Edn. New York, NY: Psychology Press.

Google Scholar

Hambrick, D. Z., Oswald, F. L., Altmann, E. M., Meinz, E. J., Gobet, F., and Campitelli, G. (2014a). Deliberate practice: is that all it takes to become an expert? Intelligence 45, 34–45. doi: 10.1016/j.intell.2013.04.001

CrossRef Full Text | Google Scholar

Hambrick, D. Z., Oswald, F. L., Altmann, E. M., Meinz, E. J., Gobet, F., and Campitelli, G. (2014b). Accounting for expert performance: the devil is in the details. Intelligence 45, 112–114. doi: 10.1016/j.intell.2014.01.007

CrossRef Full Text | Google Scholar

Healy, A. F., Kole, J. A., and Bourne, L. E. (2014). Training principles to advance expertise. Front. Psychol. 5:131. doi: 10.3389/fpsyg.2014.00131

CrossRef Full Text | Google Scholar

Helsen, W. F., Starkes, J. L., and Hodges, N. J. (1998). Team sports and the theory of deliberate practice. J. Sports Exerc. Psychol. 20, 13–35.

Hoffman, R. R. (2014). The Psychology of Expertise: Cognitive Research and Empirical AI. New York, NY: Springer.

Holding, D. H. (1985). The Psychology of Chess Skill. Hillsdale, NJ: Erlbaum Associates.

Google Scholar

Holding, D. H. (1992). Theories of chess skill. Psychol. Res. 54, 10–16. doi: 10.1007/BF01359218

CrossRef Full Text | Google Scholar

Huntsinger, J. R., and Clore, G. L. (2011). “Emotion and social metacognition,” in Social Metacognition, eds P. Briñol and K. DeMarree (New York: Psychology Press), 199–217.

Google Scholar

Igou, E. R. (2004). Lay theories in affective forecasting: the progression of affect. J. Exp. Soc. Psychol. 40, 528–534. doi: 10.1016/j.jesp.2003.09.004

CrossRef Full Text | Google Scholar

Igou, E. R. (2008). “How long will I suffer?” versus “How long will you suffer?” A self-other effect in affective forecasting. J. Pers. Soc. Psychol. 95, 899–917. doi: 10.1037/a0011619

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Igou, E. R., and Bless, H. (2003). Inferring the importance of arguments: order effects and conversational Rules. J. Exp. Soc. Psychol. 39, 91–99. doi: 10.1016/S0022-1031(02)00509-7

CrossRef Full Text | Google Scholar

Igou, E. R., and Bless, H. (2005). The conversational basis for the dilution effect. J. Lang. Soc. Psychol. 24, 25–35. doi: 10.1177/0261927X04273035

CrossRef Full Text | Google Scholar

Igou, E. R., and Bless, H. (2007). Conversational expectations as a basis for order effects in persuasion. J. Lang. Soc. Psychol. 26, 260–273. doi: 10.1177/0261927X06303454

CrossRef Full Text | Google Scholar

Jackson, R. C., and Baker, J. S. (2001). Routines, rituals, and rugby: case study of a world class goal kicker. Sport Psychol. 15, 48–65.

Google Scholar

Jacoby, L. L., Kelley, C. M., Brown, J., and Jaschenko, J. (1989). Becoming famous overnight: limits of the ability to avoid unconscious influences of the past. J. Pers. Soc. Psychol. 56, 326–338. doi: 10.1037/0022-3514.56.3.326

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Jeannerod, M. (1994). The representing brain: neural correlates of motor intention and imagery. Behav. Brain Sci. 17, 187–245. doi: 10.1017/S0140525X00034026

CrossRef Full Text | Google Scholar

Jeannerod, M. (2006). Motor Cognition: What Actions Tells The Self. New York: Oxford University Press. doi: 10.1093/acprof:oso/9780198569657.001.0001

CrossRef Full Text | Google Scholar

Kahneman, D., and Snell, J. (1992). Predicting a change in taste: do people know what they will like? J. Behav. Decis. Mak. 5, 187–200. doi: 10.1002/bdm.3960050304

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Kitsantas, A., and Kavussanu, M. (2011). “Acquisition of sport knowledge and skill: the role of self-regulatory processes,” in Handbook of Self-Regulation on Learning and Performance, eds B. J. Zimmerman and D. H. Schunk (New York: Routledge), 217–233.

Klostermann, A., Kredel, R., and Hossner, E. (2013). The “quiet eye” and motor performance: task demands matter! J. Exp. Psychol. Hum. Percept. Perform. 39, 1270–1278. doi: 10.1037/a0031499

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Koriat, A. (1993). How do we know what we do? The accessibility model of the feeling of knowing. Psychol. Rev. 100, 609–639. doi: 10.1037/0033-295X.100.4.609

CrossRef Full Text | Google Scholar

Laakso, A. (2011). Embodiment and development in cognitive science. Cogn. Brain Behav. 4, 409–425.

Google Scholar

Lewis, C., and Marx, J. (1996). One More Victory Lap: My Personal Diary of an Olympic Year. Santa Monica, CA: Athletics International.

Loewenstein, G. (2011). “Affect regulation and affective forecasting,” in Handbook of Emotion Regulation, ed. J. J. Gross (New York, NY: Guilford Press), 180–203.

Google Scholar

Lyons, I. M., and Beilock, S. L. (2012). When math hurts: math anxiety predicts pain network activation in anticipation of doing math. PLoS ONE 7:e48076. doi: 10.1371/journal.pone.0048076

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Machado, A., and Silva, F. J. (2007). Toward a richer view of the scientific method: the role of conceptual analysis. Am. Psychol. 62, 671–681. doi: 10.1037/0003-066X.62.7.671

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

MacIntyre, T., and Moran, A. (2007a). Exploring imagery use and meta-imagery processes: qualitative investigations with elite canoe-slalom athletes. J. Imagery Res. Sport Phys. Act. 2:3.

MacIntyre, T., and Moran, A. (2007b). Exploring imagery use and meta-imagery processes: qualitative investigations with an elite multi-sport sample. J. Imagery Res. Sport Phys. Act. 2:4.

MacIntyre, T., Moran, A., Guillot, A., and Collet, C. (2013). An emerging paradigm: a strength-based approach to exploring mental imagery. Front. Hum. Neurosci. 7:104. doi: 10.3389/fnhum.2013.00104

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

MacIntyre, T., and Moran, A. P. (2010). “Meta-imagery processes among elite sports performers,” in The Neurophysiological Foundations of Mental and Motor Imagery, eds A. Guillot and C. Collet (Oxford: Oxford University Press), 227–244. doi: 10.1093/acprof:oso/9780199546251.003.0016

CrossRef Full Text | Google Scholar

Mann, D., Dicks, M., Cañal-Bruland, R., and van der Kamp, J. (2013). Neurophysiological studies may provide a misleading picture of how perceptual-motor interactions are coordinated. Iperception 4, 78–80. doi: 10.1068/i0569ic

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Mann, D. T. Y., Williams, A. M., Ward, P., and Janelle, C. M. (2007). Perceptual-cognitive expertise in sport: a meta-analysis. J. Sport Exerc. Psychol. 29, 457–478.

Pubmed Abstract | Pubmed Full Text | Google Scholar

Martin, L. L. (1986). Se/reset: the use and disuse of concepts in impression formation. J. Pers. Soc. Psychol. 51, 93–120. doi: 10.1037/0022-3514.51.3.493

CrossRef Full Text | Google Scholar

Martin, L. L., Ward, D. W., Achee, J. W., and Wyer, R. S. (1993). Mood as input: people have to interpret the motivational implications of their moods. J. Pers. Soc. Psychol. 64, 317–326. doi: 10.1037/0022-3514.64.3.317

CrossRef Full Text | Google Scholar

McCann, P., Lavallee, D., and Lavallee, R. M. (2001). The effect of pre-shot routines on golf wedge shot performance. Eur. J. Sport Sci. 1, 231–240. doi: 10.1080/17461390100071503

CrossRef Full Text | Google Scholar

Mesagno, C., and Mullane-Grant, T. (2010). A comparison of different pre-performance routines as possible choking interventions. J. Appl. Sport Psychol. 22, 343–360. doi: 10.1080/10413200.2010.491780

CrossRef Full Text | Google Scholar

Moran, A. (2009). Cognitive psychology in sport: progress and prospects. Psychol. Sport Exerc. 10, 420–426. doi: 10.1016/j.psychsport.2009.02.010

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Moran, A., Guillot, A., MacIntyre, T., and Collet, C. (2012). Re-imagining mental imagery: building bridges between cognitive neuroscience and sport psychology. Br. J. Psychol. 103, 224–247. doi: 10.1111/j.2044-8295.2011.02068.x

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Moran, A. P. (1996). The Psychology of Concentration in Sport Performers: A Cognitive Analysis. Hove, East Sussex: Psychology Press.

Google Scholar

Moran, A. P. (2002). In the mind’s eye. Psychologist 15, 14–15.

Google Scholar

Moran, A. P. (2012a). Sport and Exercise Psychology: A Critical Introduction. London: Routledge.

Google Scholar

Moran, A. P. (2012b). Thinking in action: some insights from cognitive sport psychology. Think. Skills Creat. 7, 85–92. doi: 10.1016/j.tsc.2012.03.005

CrossRef Full Text | Google Scholar

Munroe, K. J., Giacobbi, P. R. Jr., Hall, C., and Weinberg, R. (2000). The four Ws of imagery use: where, when, why, and what. Sport Psychol. 14, 119–137.

Google Scholar

Nelson, T. O. (1999). “Cognition versus metacognition,” in The Nature of Cognition, ed. R. J. Sternberg (Cambridge, MA: The MIT Press), 625–641.

Google Scholar

Nelson, T. O., and Narens, L. (1994). Why Investigate Metacognition? Metacognition: Knowing about Knowing. Cambridge, MA: The MIT Press.

Google Scholar

Nietfield, J. L. (2003). An examination of metacognitive strategy use and monitoring skills by competitive middle distance runners. J. Appl. Sport Psychol. 15, 307–320. doi: 10.1080/714044199

CrossRef Full Text | Google Scholar

Olson, C. J., and Nyberg, L. (2011). Brain simulation of action may be grounded in physical experience. Neurocase 17, 501–505. doi: 10.1080/13554794.2010.547504

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Orlick, T., and Partington, J. (1988). Mental links to excellence. Sport Psychol. 2, 105–130.

Google Scholar

Palmer, E. C., David, A. S., and Fleming, S. M. (2013). Effects of age on metacognitive efficiency. Conscious. Cogn. 28, 151–160. doi: 10.1016/j.concog.2014.06.007

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Pearson, J., Rademaker, R. L., and Tong, F. (2011). Evaluating the mind’s eye: the metacognition of visual imagery. Psychol. Sci. 22, 1535–1542. doi: 10.1177/0956797611417134

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Perfect, T. J., and Schwartz, B. L. (2002). Applied Metacognition. Cambridge: Cambridge University Press. doi: 10.1017/CBO9780511489976

CrossRef Full Text | Google Scholar

Reber, R., Winkielman, P., and Schwarz, N. (1998). Effects of perceptual fluency on affective judgements. Psychol. Sci. 9, 45–48. doi: 10.1111/1467-9280.00008

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Roeckelein, J. E. (2004). Imagery in Psychology: A Reference Guide. Westport, CT: Greenwood Publishing Group.

Google Scholar

Rosenbaum, D. A. (2005). The cinderella of psychology: the neglect of motor control in the science of mental life and behavior. Am. Psychol. 60, 308–317. doi: 10.1037/0003-066X.60.4.308

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Ross, P. E. (2006). The expert mind. Sci. Am. 295, 64–71. doi: 10.1038/scientificamerican0806-64

CrossRef Full Text | Google Scholar

Schraw, G., and Dennison, R. S. (1994). Assessing metacognitive awareness. Contemp. Educ. Psychol. 19, 460–475. doi: 10.1006/ceps.1994.1033

CrossRef Full Text | Google Scholar

Schwarz, N. (1990). “Feeling as information: informational and motivational functions of affective states,” in Handbook of Motivation and Cognition: Foundations of Social Behavior, eds R. M. Sorrentino and E. T. Higgins (New York: Guilford Press), 527–561.

Schwarz, N. (1994). “Judgment in a social context: biases, shortcomings, and the logic of conversation,” in Advances in Experimental Social Psychology, ed. P. Z. Mark (New York: Academic Press), 123–162.

Google Scholar

Schwarz, N. (2002). “Situated cognition and the wisdom of feelings: cognitive tuning,” in The Wisdom in Feelings, eds L. F. Barrett and P. Salovey (New York: Guilford Press), 144–166.

Google Scholar

Schwarz, N., Bless, H., Strack, F., Klumpp, G., Rittenauer-Schatka, H., and Simons, A. (1991). Ease of retrieval as information: another look at the availability heuristic. J. Pers. Soc. Psychol. 61, 95–202. doi: 10.1037/0022-3514.61.2.195

CrossRef Full Text | Google Scholar

Schwarz, N., and Clore, G. L. (1983). Mood, misattribution, and judgments of well-being: informative and directive functions of affective states. J. Pers. Soc. Psychol. 45, 513–523. doi: 10.1037/0022-3514.45.3.513

CrossRef Full Text | Google Scholar

Schwartz, N., and Diaz, F. (2014). “Quantifying human metacognition for the neurosciences” in The Cognitive Neuroscience of Metacognition, eds S. M. Fleming and E. D. Frith (New York: Springer), 9–23. doi: 10.1007/978-3-642-45190-4_2

CrossRef Full Text | Google Scholar

Shea, N., Boldt, A., Bang, D., Yeung, N., Heyes, C., and Frith, C. D. (2014). Supra-personal cognitive control and metacognition. Trends Cogn. Sci. 18, 186–193. doi: 10.1016/j.tics.2014.01.006

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Simon, D. A., and Bjork, R. A. (2001). Metacognition in motor learning. J. Exp. Psychol. Learn. Mem. Cogn. 27, 907–912. doi: 10.1037/0278-7393.27.4.907

CrossRef Full Text | Google Scholar

Singer, R. N. (2000). Performance and human factors: considerations about cognition and attention for self-paced and externally-paced events. Ergonomics 43, 1661–1680. doi: 10.1080/001401300750004078

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Singer, R. N. (2002). Pre-performance state, routines, and automaticity: what does it take to realize expertise in self-paced events? J. Sport Exerc. Psychol. 24, 359–375.

Google Scholar

Stanley, J., and Krakauer, J. W. (2013). Motor skill depends on knowledge of facts. Front. Hum. Neurosci. 7:503. doi: 10.3389/fnhum.2013.00503

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Stanovich, K. E. (2011). Rationality and the Reflective Mind. Oxford: Oxford University Press.

Google Scholar

Sternberg, R. (2001). “Metacognition, abilities, and developing expertise: what makes an expert student?” in Metacognition in Learning and Instruction, Vol. 19, ed. H. J. Hartman (Dordrecht: Kluwer Academic Publishers), 247–260.

Google Scholar

Sternberg, R. J., and Sternberg, K. (2012). Cognitive Psychology. Belmont, CA: Wadsworth.

Google Scholar

Strack, F., and Bless, H. (1994). Memory for non-occurrences: metacognitive and presuppositional strategies. J. Mem. Lang. 33, 203–217. doi: 10.1006/jmla.1994.1010

CrossRef Full Text | Google Scholar

Tarricone, P. (2011). The Taxonomy of Metacognition. New York: Psychology Press.

Google Scholar

Toner, J. (2014). Knowledge of facts mediate “continuous improvement” in elite sport: a comment on Stanley and Krakauer (2013). Front. Hum. Neurosci. 8:142. doi: 10.3389/fnhum.2014.00142

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Toner, J., and Moran, A. (2011). The effects of conscious processing on golf putting proficiency and kinematics. J. Sport. Sci. 29, 673–683. doi: 10.1080/02640414.2011.553964

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Toner, J., Moran, A., and Jackson, R. (2013). The effect of avoidant instructions on golf putting proficiency and kinematics. Psychol. Sport Exerc. 14, 501–507. doi: 10.1016/j.psychsport.2013.01.008

CrossRef Full Text | Google Scholar

Van Overschelde, J. P. (2008). “Metacognition: knowing about knowing,” in Handbook of Metamemory and Memory, eds J. Dunlosky and R. A. Bjork (New York: Psychology Press), 47–71.

Google Scholar

Vickers, J. N. (2007). Perception, Cognition, and Decision Training: The Quiet Eye in Action. Champaign, IL: Human Kinetics.

Google Scholar

Vine, S. J., Moore, L. J., and Wilson, M. R. (2011). Quiet eye training facilitates competitive putting performance in elite golfers. Front. Psychol. 2:8. doi: 10.3389/fpsyg.2011.00008

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Vine, S. J., Moore, L. J., and Wilson, M. R. (2014). Quiet eye training: the acquisition, refinement and resilient performance of targeting skills. Eur. J. Sport Sci. 14(Suppl. 1), S235–S242. doi: 10.1080/17461391.2012.683815

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Vogt, S., Di Rienzo, F., Collet, C., Collins, A., and Guillot, A. (2013). Multiple roles of motor imagery during action observation. Front. Hum. Neurosci. 7:807. doi: 10.3389/fnhum.2013.00807

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Voss, M. W., Kramer, A. F., Basak, C., Prakash, R. S., and Roberts, B. (2010). Are expert athletes“expert” in the cognitive laboratory? A meta-analytic review of basic attention and perception and sport expertise. Appl. Cogn. Psychol. 24, 812–826. doi: 10.1002/acp.1588

CrossRef Full Text | Google Scholar

Weil, L. G., Fleming, S. M., Dumontheil, I., Kilford, E. J., Weil, R. S., Rees, G.,et al. (2013). The development of metacognitive ability in adolescence. Conscious. Cogn. 22, 264–271. doi: 10.1016/j.concog.2013.01.004

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Weinberg, R., Butt, J., Knight, B., Burke, K. L., and Jackson, A. (2003). The relationship between the use and effectiveness of imagery: an exploratory investigation. J. Appl. Sport Psychol. 15, 26–40. doi: 10.1080/10413200305398

CrossRef Full Text | Google Scholar

Williams, A. M., and Ericsson, K. A. (2005). Perceptual-cognitive expertise in sport: some considerations when applying the expert performance approach. Hum. Mov. Sci. 24, 283–307. doi: 10.1016/j.humov.2005.06.002

Pubmed Abstract | Pubmed Full Text | CrossRef Full Text | Google Scholar

Williams, A. M., and Ford, P. R. (2007). Expertise and sport performance. Int. Rev. Sport Exerc. Psychol. 1, 4–18. doi: 10.1080/17509840701836867

Wilson, T. D., and Gilbert, D. T. (2003). “Affective forecasting,” in Advances in Experimental Social Psychology, ed. M. Zanna (New York: Elsevier), 345–411.

Google Scholar

Keywords: metacognition, expertise, cognition, motor cognition, social cognition, cognitive neuroscience, sport, sport psychology

Citation: MacIntyre TE, Igou ER, Campbell MJ, Moran AP and Matthews J (2014) Metacognition and action: a new pathway to understanding social and cognitive aspects of expertise in sport. Front. Psychol. 5:1155. doi: 10.3389/fpsyg.2014.01155

Received: 19 June 2014; Accepted: 24 September 2014;
Published online: 16 October 2014.

Edited by:

Guillermo Campitelli, Edith Cowan University, Australia

Reviewed by:

Derrick L. Hassert, Trinity Christian College, USA
Tom Carr, Michigan State University, USA
Guillermo Macbeth, National Scientific and Technical Research Council, Argentina

Copyright © 2014 MacIntyre, Igou, Campbell, Moran and Matthews. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Tadhg E. MacIntyre, Department of Physical Education and Sport Sciences, University of Limerick, PESS Building, County Limerick, Limerick, Ireland e-mail: tadhg.macintyre@ul.ie

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