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Spatial working memory in heavy cannabis users: a functional magnetic resonance imaging study

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Abstract

Rationale

Many neuropsychological studies have documented deficits in working memory among recent heavy cannabis users. However, little is known about the effects of cannabis on brain activity.

Objective

We assessed brain function among recent heavy cannabis users while they performed a working memory task.

Methods

Functional magnetic resonance imaging was used to examine brain activity in 12 long-term heavy cannabis users, 6–36 h after last use, and in 10 control subjects while they performed a spatial working memory task. Regional brain activation was analyzed and compared using statistical parametric mapping techniques.

Results

Compared with controls, cannabis users exhibited increased activation of brain regions typically used for spatial working memory tasks (such as prefrontal cortex and anterior cingulate). Users also recruited additional regions not typically used for spatial working memory (such as regions in the basal ganglia). These findings remained essentially unchanged when re-analyzed using subjects’ ages as a covariate. Brain activation showed little or no significant correlation with subjects’ years of education, verbal IQ, lifetime episodes of cannabis use, or urinary cannabinoid levels at the time of scanning.

Conclusions

Recent cannabis users displayed greater and more widespread brain activation than normal subjects when attempting to perform a spatial working memory task. This observation suggests that recent cannabis users may experience subtle neurophysiological deficits, and that they compensate for these deficits by “working harder”—calling upon additional brain regions to meet the demands of the task.

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Acknowledgments

Supported in part by NIDA Grant R01 12483 (to Dr. Yurgelun-Todd) and NIDA Grant 5 R37 DA-10346 (to Dr. Pope).

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Correspondence to Deborah A. Yurgelun-Todd.

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Kanayama, G., Rogowska, J., Pope, H.G. et al. Spatial working memory in heavy cannabis users: a functional magnetic resonance imaging study. Psychopharmacology 176, 239–247 (2004). https://doi.org/10.1007/s00213-004-1885-8

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  • DOI: https://doi.org/10.1007/s00213-004-1885-8

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