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Marijuana and memory intrusions.

A Pfefferbaum, C F Darley, J R Tinklenberg

    The Journal of Nervous and Mental Disease
    |December 1, 1977
    PubMed
    Summary
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    Marijuana intoxication and association-based rehearsal both impair memory recall. Marijuana specifically increases novel intrusive thoughts, potentially explaining marijuana-induced thought disorders.

    Area of Science:

    • Neuroscience
    • Cognitive Psychology

    Background:

    • Marijuana's psychoactive compound, delta-9-tetrahydrocannabinol (THC), is known to affect cognitive functions.
    • Understanding the specific cognitive deficits associated with THC is crucial for addressing its effects.

    Purpose of the Study:

    • To investigate the impact of marijuana intoxication on free recall memory.
    • To examine the role of rehearsal strategies in modulating memory performance under marijuana influence.
    • To identify the types of memory intrusions associated with marijuana use.

    Main Methods:

    • A controlled study involving 16 college-educated males.
    • Comparison of memory recall under marijuana (0.3 mg/kg THC) versus placebo conditions.
    • Utilized two rehearsal procedures: regular overt rehearsal and association-overt rehearsal.

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    Main Results:

    • Both marijuana and association-overt rehearsal significantly reduced correct recalls.
    • Both conditions increased memory intrusions (items incorrectly recalled).
    • Marijuana uniquely and significantly increased the occurrence of novel, unassociated intrusions.

    Conclusions:

    • Marijuana intoxication appears to disrupt cognitive processes by increasing intrusive thoughts.
    • The observed increase in novel intrusions may underlie some thought disorders associated with marijuana use.
    • Association-based rehearsal, while impacting recall, did not produce the same pattern of novel intrusions as marijuana.