Marijuana: Differential effects on right and left hemisphere functions in man |
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| Authors: | Richard C. Stillman Owen Wolkowitz Herbert Weingartner Ivan Waldman Emil V. DeRenzo Richard Jed Wyatt |
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| Affiliation: | 1. Intramural Research Program, National Institute on Drug Abuse, Rockville, Maryland 20852, USA;2. Laboratory of Clinical Psychopharmacology, Division of Special Mental Health, Intramural Research Program, Saint Elizabeths Hospital Washington, D.C. 20032, USA;3. University of Maryland School of Medicine Baltimore, Maryland 21201, USA;4. National Institute of Mental Health Bethesda, Maryland 20014, USA |
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| Abstract: | Marijuana, smoked at moderate doses, produced a differential impairment of the reaction times of right-handed males to pictorial stimuli presented to the left and right cerebral hemispheres. After smoking marijuana responses to pictorial stimuli presented to the right hemisphere were slowed significantly less than to the left hemisphere. Responses to verbal stimuli (trigrams) were slowd equally in both hemispheres, preserving an initial left hemisphere superiority for this material. This suggests that marijuana may differentially change the processing speed or relative dominance of man's two cerebral hemispheres, depending on the nature of the material being processed. |
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