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Methylphenidate: rate-dependent drug effects in hyperactive boys.

K Weber

    Psychopharmacology
    |January 1, 1985
    PubMed
    Summary
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    Methylphenidate did not affect operant responding rates in hyperactive boys as predicted. However, within a fixed ratio schedule, drug effects were dependent on baseline response rates, supporting the rate dependency hypothesis.

    Area of Science:

    • Behavioral Psychology
    • Neuropharmacology
    • Child Psychology

    Background:

    • Methylphenidate is commonly prescribed for hyperactive children.
    • The rate dependency hypothesis predicts differential drug effects based on baseline response rates.

    Purpose of the Study:

    • To investigate if methylphenidate's effects on operant responding in hyperactive boys vary with predrug baseline rates.
    • To test the rate dependency hypothesis in the context of methylphenidate administration.

    Main Methods:

    • A multiple FR-DRL (fixed ratio-differential reinforcement of low rates) schedule was employed.
    • Three dosage levels of methylphenidate (placebo, 0.3 mg/kg, 1.0 mg/kg) were administered blindly.
    • Operant responding rates were measured using nickels as reinforcers.

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    Main Results:

    • Methylphenidate did not significantly alter DRL response rates.
    • FR response rates increased linearly with increasing methylphenidate dosage.
    • Within the FR schedule, lower baseline rates predicted increased responding, while higher baseline rates predicted decreased or unchanged responding.

    Conclusions:

    • The predicted between-schedule differences in methylphenidate effects were not observed.
    • Methylphenidate's impact on operant responding within the FR schedule aligns with the rate dependency hypothesis.
    • Baseline response rate is a critical factor in determining methylphenidate's behavioral effects.