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Chlorpromazine and serial reaction performance.

L Hartley, T Henry, J Couper-Smartt

    British Journal of Psychology (London, England : 1953)
    |May 1, 1978
    PubMed
    Summary
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    High doses of chlorpromazine impaired serial reaction performance in male subjects. The drug reduced response speed and increased errors, with effects on speed appearing later than those on errors.

    Area of Science:

    • Psychopharmacology
    • Human Performance Studies

    Background:

    • Chlorpromazine is an antipsychotic medication with known cognitive side effects.
    • Understanding dose-dependent effects on cognitive functions like reaction time is crucial for clinical application.

    Purpose of the Study:

    • To investigate the impact of two different doses of chlorpromazine (25 mg and 75 mg) on serial reaction performance.
    • To determine if chlorpromazine affects response speed, accuracy, and error types.

    Main Methods:

    • Twelve male human subjects participated in the study.
    • Serial reaction performance was assessed after administration of either 25 mg or 75 mg of chlorpromazine.
    • Performance metrics included speed, number of correct responses, and errors of commission/omission.

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    Main Results:

    • The higher dose (75 mg) of chlorpromazine significantly reduced response speed and the number of correct responses.
    • Errors of commission and omission were elevated with the high dose.
    • Adverse effects on speed were observed towards the end of the 30-minute test, while error increases were present throughout.

    Conclusions:

    • Chlorpromazine, particularly at higher doses, adversely affects cognitive performance, specifically serial reaction time.
    • The dose-dependent nature of these effects highlights the importance of careful dosage in clinical settings.
    • Different cognitive domains (speed vs. accuracy/errors) may exhibit varied temporal responses to chlorpromazine administration.