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PhD Defence

Thinking High: The impact of cannabis on human cognition

Thursday 6 October 2016
Academy Building
Rapenburg 73
2311 GJ Leiden


The research presented in this thesis focused on the effects of cannabis on mental functions and the brain. Specifically, the investigation aimed at exploring how cannabis affects creative thinking, awareness of errors, and the neurotransmitter dopamine among regular cannabis users. It was discovered that cannabis does not improve creativity and that it can decrease error awareness and impair dopaminergic functioning. Consequently, these findings allow for a better understanding of the nature of subtle mental impairments among chronic cannabis users.

Full text summary


  • Prof. B. Hommel


PhD defences are free; you do not have to register.

PhD dissertations

PhD dissertations by Leiden PhD students are available digitally after the defence through the Leiden Repository, that offers free access to these PhD dissertations. Please note that in some cases a dissertation may be under embargo temporarily and access to its full-text version will only be granted later.

Press contact

Inès van Arkel, Scientific Communications Adviser, Leiden University
+31 71 527 3282

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