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In a research group setting, marijuana increased social-emotional interpersonal communication and decreased task-oriented behavior. Following a frustration stimulus, groups of marijuana smokers appeared nonintoxicated and showed improvement in consensus problem solving. Interpersonal behavior with marijuana may depend in part, on the presence or absence of demand characteristics for task performance. Creativity in group problem solving was not improved by marijuana.
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Salzman et al. (1977) studied this question.
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