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Psychopharmacology

, Volume 185, Issue 3, pp 358–368 | Cite as

Long-term effects of frequent cannabis use on working memory and attention: an fMRI study

  • Gerry JagerEmail author
  • Rene S. Kahn
  • Wim Van Den Brink
  • Jan M. Van Ree
  • Nick F. Ramsey
Original Investigation

Abstract

Rationale

Excessive use of cannabis may have long-term effects on cognitive abilities. Mild impairments have been found in several cognitive domains, particularly in memory and attention. It is not clear, however, whether these effects also occur with moderate, recreational use of cannabis. Furthermore, little is known about underlying brain correlates.

Objectives

The aim of this study is to assess brain function in frequent but relatively moderate cannabis users in the domains of working memory and selective attention.

Methods

Functional magnetic resonance imaging was used to examine verbal working memory and visuo-auditory selective attention in ten frequent cannabis users (after 1 week of abstinence) and ten non-using healthy controls. Groups were similar in age, gender and estimated IQ.

Results

Cannabis users and controls performed equally well during the working memory task and the selective attention task. Furthermore, cannabis users did not differ from controls in terms of overall patterns of brain activity in the regions involved in these cognitive functions. However, for working memory, a more specific region-of-interest analysis showed that, in comparison to the controls, cannabis users displayed a significant alteration in brain activity in the left superior parietal cortex.

Conclusion

No evidence was found for long-term deficits in working memory and selective attention in frequent cannabis users after 1 week of abstinence. Nonetheless, frequent cannabis use may affect brain function, as indicated by altered neurophysiological dynamics in the left superior parietal cortex during working memory processing.

Keywords

Cannabis Cognition Working memory Selective attention fMRI Neuroimaging Brain function 

Notes

Acknowledgements

This research was supported by a grant of The Netherlands Organisation for Health Research and Development as part of their Addiction Program (ZonMW 310-00-036). The study was performed with approval of the Ethics Committee from the University Medical Center Utrecht.

We thank Maartje de Win, Hylke Vervaeke, Mieke Deenen and Judith Bosman for their assistance with subject recruitment and data collection.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Gerry Jager
    • 1
    Email author
  • Rene S. Kahn
    • 1
  • Wim Van Den Brink
    • 2
  • Jan M. Van Ree
    • 3
  • Nick F. Ramsey
    • 1
  1. 1.Rudolf Magnus Institute of Neuroscience, Department of Psychiatry, A.01.126University Medical CenterUtrechtThe Netherlands
  2. 2.Amsterdam Institute for Addiction Research and Department of Psychiatry, University of AmsterdamAcademic Medical CenterAmsterdamThe Netherlands
  3. 3.Rudolf Magnus Institute of Neuroscience, Department of Pharmacology and AnatomyUniversity Medical CenterUtrechtThe Netherlands

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