Khat Use Is Associated with Impaired Working Memory and Cognitive Flexibility

• Lorenza S. Colzato ,

  * E-mail: colzato@fsw.leidenuniv.nl

  Affiliation Institute for Psychological Research and Leiden Institute for Brain and Cognition, Leiden University, Leiden, The Netherlands

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• Manuel J. Ruiz,

  Affiliation Institute for Psychological Research and Leiden Institute for Brain and Cognition, Leiden University, Leiden, The Netherlands

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• Wery P. M. van den Wildenberg,

  Affiliation Psychology Department, Amsterdam Center for the Study of Adaptive Control in Brain and Behaviour (Acacia), University of Amsterdam, Amsterdam, The Netherlands

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• Bernhard Hommel

  Affiliation Institute for Psychological Research and Leiden Institute for Brain and Cognition, Leiden University, Leiden, The Netherlands

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