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Behavior Modification
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*Attention Deficit Hyperactivity Disorder
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*METHYLPHENIDATE
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Differential Effects of Methylphenidate and Self-Reinforcement on Attention-Deficit Hyperactivity Disorder

Olatunji Ajibola

Paul W. Clement

Fuller Theological Seminary

Six boys aged 9 to 12 years attended a tutoring class focusing on reading for 30 minutes each morning. The investigators employed a modified Latin-square design in which each child began with a 5-day baseline phase followed by six 10-day treatment phases that used drug placebo, noncontingent reinforcers, 0.3 mg/kg methylphenidate, 0.7 mg/kg methylphenidate, and self-re-inforcement in various combinations. Amount of academic performance was the major measure of outcome and the target behavior of self-reinforcement. Drug placebo and noncontingent reinforcers had no systematic impact. Methylphenidate had differential effects across the recorded behaviors. Self-reinforcement improved the target behavior; the mean effect size for self-reinforcement was 2.66. The combined effects of methylphenidate and self-reinforcement on academic performance were greater than either of the treatments given alone (mean effect size = 2.89).

Behavior Modification, Vol. 19, No. 2, 211-233 (1995)
DOI: 10.1177/01454455950192004
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