%A Colzato,Lorenza %A Ruiz,Manuel %A Van Den Wildenberg,Wery %A Bajo,Maria Teresa %A Hommel,Bernhard %D 2011 %J Frontiers in Psychology %C %F %G English %K Chronic use,Dopamine,khat,SSRT,stop-signal task %Q %R 10.3389/fpsyg.2010.00219 %W %L %M %P %7 %8 2011-January-12 %9 Original Research %+ Dr Lorenza Colzato,Leiden University,Cognitive Psychology Unit and Leiden Institute for Brain and Cognition,Leiden,Netherlands,colzato@bhommel.onmicrosoft.com %# %! Khat and inhibitory control %* %< %T Long-Term Effects of Chronic Khat Use: Impaired Inhibitory Control %U https://www.frontiersin.org/articles/10.3389/fpsyg.2010.00219 %V 1 %0 JOURNAL ARTICLE %@ 1664-1078 %X 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.