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Does methylphenidate constrict cognitive functioning?

M V Solanto, E H Wender

    Journal of the American Academy of Child and Adolescent Psychiatry
    |November 1, 1989
    PubMed
    Summary
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    Stimulant medication for children with attention deficit disorder with hyperactivity (ADDH) did not impair cognitive flexibility. Methylphenidate sustained performance on divergent thinking tasks, contrary to expectations of over-focusing.

    Area of Science:

    • Neuroscience
    • Child Psychology
    • Pharmacology

    Background:

    • Attention deficit disorder with hyperactivity (ADDH) is often treated with stimulants.
    • Stimulants are hypothesized to enhance attention through over-focusing.
    • This over-focusing might negatively impact cognitive flexibility and divergent thinking.

    Purpose of the Study:

    • To investigate the effect of methylphenidate on cognitive flexibility in children with ADDH.
    • To test the hypothesis that stimulants impair divergent thinking in ADDH children.

    Main Methods:

    • Nineteen children (6-10 years) diagnosed with ADDH participated.
    • Participants completed modified Wallach-Kogan (W-K) divergent thinking tasks.
    • Testing occurred at baseline, with placebo, and with three methylphenidate dosages (.3, .6, 1.0 mg/kg).

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    Main Results:

    • Methylphenidate did not decrease performance on divergent thinking tasks.
    • Productivity was sustained on medication, unlike the decline observed on non-medication days.
    • A subgroup of children showed significant output increases, suggesting potential overarousal.

    Conclusions:

    • The hypothesis that methylphenidate impairs cognitive flexibility in ADDH children was not supported.
    • Methylphenidate appears to sustain, rather than hinder, divergent thinking abilities in this population.
    • Some ADDH children may exhibit an overaroused response to methylphenidate, warranting further investigation.