@ARTICLE{10.3389/fpsyg.2010.00219, AUTHOR={Colzato, Lorenza and Ruiz, Manuel and Van Den Wildenberg, Wery and Bajo, Maria Teresa and 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/articles/10.3389/fpsyg.2010.00219}, DOI={10.3389/fpsyg.2010.00219}, ISSN={1664-1078}, ABSTRACT={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.} }