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Introversion/extroversion, time stress, and caffeine: effect on verbal performance.

W Revelle, P Amaral, S Turriff

    Science (New York, N.Y.)
    |April 9, 1976
    PubMed
    Summary
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    Time pressure and caffeine significantly impacted introverts' verbal test performance more than extroverts. Introverts showed a greater decline in scores under these conditions.

    Area of Science:

    • Psychology
    • Cognitive Science
    • Human Performance

    Background:

    • Introversion and extroversion represent fundamental personality dimensions.
    • Caffeine is a widely consumed stimulant known to affect cognitive functions.
    • Time pressure is a common factor in academic and professional assessments.

    Purpose of the Study:

    • To investigate the differential effects of time pressure and caffeine on the verbal abilities of introverts and extroverts.
    • To compare the performance decrements in introverts versus extroverts under combined stimulant and time-pressure conditions.

    Main Methods:

    • Participants completed verbal ability tests analogous to the Graduate Record Examination.
    • Experimental conditions included the administration of 200 milligrams of caffeine and imposed time constraints.

    Related Experiment Videos

  • Performance metrics were analyzed to quantify score changes across different personality types.

    • Main Results:

    • Under time pressure and caffeine, introverts' performance decreased by 0.63 standard deviation.
    • Extroverts experienced a performance decrease of 0.44 standard deviation under the same conditions.
    • The results indicate a more pronounced negative effect on introverts' cognitive performance.

    Conclusions:

    • Time pressure combined with caffeine administration disproportionately impairs the verbal test performance of introverts compared to extroverts.
    • These findings have implications for understanding how environmental stressors and stimulants interact with personality traits.
    • Consideration of personality differences may be important in designing and evaluating performance-based assessments.