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Marihuana effects on free recall and subjective organization of pictures and words

Marihuana effects on free recall and subjective organization of pictures and words

Psychopharmacology 55(3): 257-262

The free recall of pictures and words was compared following the administration of marihuana or placebo [to human subjects] in a multitrial free recall task. Since pictures are thought to be registered in both visual and verbal memory stores with this encoding being mediated by some form of mental imagery, it was predicted that marihuana would produce a greater deficit in word recall in comparison to picture recall because the drug has been reported to facilitate imagery. A trend in the opposite direction followed intoxication; picture recall was inferior to word recall in the latter stages of acquisition. Although overall recall was inferior under marihuana, no differences were found between the treatment conditions in subjective organization as determined by a variety of clustering measures. Recall performance following marihuana intoxication was positively related to level of recall performance in the placebo condition.

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Accession: 005853150

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PMID: 414287

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