AUTHOR=Colzato Lorenza S., Ruiz Manuel , Van Den Wildenberg Wery P., Bajo Maria Teresa , Hommel Bernhard 

TITLE=Long-Term Effects of Chronic Khat Use: Impaired Inhibitory Control

JOURNAL=Frontiers in Psychology

VOLUME=1

YEAR=2011

URL=https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2010.00219

DOI=10.3389/fpsyg.2010.00219

ISSN=1664-1078

ABSTRACT=<p>So far no studies have systematically looked into the cognitive consequences of khat use. This study compared the ability to inhibit and execute behavioral responses in adult khat users and khat-free controls, matched in terms of age, race, gender distribution, level of intelligence, alcohol and cannabis consumption. Response inhibition and response execution were measured by a stop-signal paradigm. Results show that users and non-users are comparable in terms of response execution but users need significantly more time to inhibit responses to stop signals than non-users.</p>