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Related Experiment Videos

Marihuana effects on TAT form and content.

W T Roth, M J Rosenbloom, C F Darley

    Psychopharmacologia
    |September 17, 1975
    PubMed
    Summary

    This study found that Delta-9-tetrahydrocannabinol (THC) in marijuana altered story writing, creating a timeless, disjointed narrative style. While not affecting hostile or sexual themes, THC increased novelty and contradictory ideas in creative expression.

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    Area of Science:

    • Psychopharmacology
    • Cognitive Psychology
    • Neuroscience

    Background:

    • Marijuana, containing Delta-9-tetrahydrocannabinol (THC), is widely used recreationally and medicinally.
    • Understanding the cognitive and psychological effects of THC is crucial for public health and policy.
    • Previous research has yielded mixed results on THC's impact on creative and narrative processes.

    Purpose of the Study:

    • To investigate the effects of a controlled dose of Delta-9-tetrahydrocannabinol (THC) on the narrative content and quality of stories.
    • To identify specific linguistic and thematic changes in written narratives induced by THC.
    • To differentiate THC-induced effects from placebo in a controlled experimental setting.

    Main Methods:

    • A double-blind, placebo-controlled study involving 72 healthy male subjects.
    • Administration of either placebo or marijuana containing 20 mg of Delta-9-tetrahydrocannabinol (THC).
    • Analysis of stories written in response to Thematic Apperception Test cards using specific content and effect-detection scales.

    Main Results:

    • Six out of ten scales designed to detect marijuana effects successfully differentiated between THC and placebo conditions.
    • Stories written under the influence of THC exhibited a timeless, non-narrative quality.
    • THC led to greater thought discontinuity and more frequent inclusion of contradictory ideas in narratives.
    • Novelty of story content was slightly increased by THC, while other aspects like imagery and repetition remained unaffected.

    Conclusions:

    • Controlled administration of Delta-9-tetrahydrocannabinol (THC) significantly alters narrative writing style, promoting discontinuity and timelessness.
    • Specific scales can effectively detect THC-induced changes in creative output, beyond general content analysis.
    • THC's impact on cognition manifests as a shift in narrative structure rather than overt thematic changes in hostility or sexuality.

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