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Negative expectancy as a mediating variable in marihuana intoxication

R O Pihl, Z Segal, D Shea

    Journal of Clinical Psychology
    |October 1, 1978
    PubMed
    Summary
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    Negative expectations reduced subjective marihuana intoxication, even with higher pulse rates, suggesting cognitive factors influence drug effects. This study explored expectancy effects in marihuana users.

    Area of Science:

    • Psychopharmacology
    • Cognitive Psychology

    Background:

    • Marihuana intoxication is influenced by various factors.
    • Expectancy effects play a significant role in drug experiences.

    Purpose of the Study:

    • To investigate the impact of negative expectancy on marihuana intoxication.
    • To examine how a threat of shock influences the subjective experience of marihuana.

    Main Methods:

    • Sixty experienced marihuana smokers were recruited.
    • Participants were exposed to marihuana or placebo under threat or no-threat conditions.
    • Threat condition involved the expectation of random shock delivery.

    Main Results:

    • The marihuana threat group reported lower subjective intoxication.

    Related Experiment Videos

  • The threat group found the environment less pleasant.
  • Higher pulse rates were observed in the marihuana threat group compared to the no-threat group.

    • Conclusions:

    • Cognitive factors, such as labeling, significantly influence the level of marihuana intoxication.
    • Negative expectancies can modulate the subjective and physiological effects of marihuana.