Anxiety, methylphenidate response, and working memory in children with ADHD
Anne-Claude Bedard1, Rosemary Tannock
1University of Toronto, Canada, Hospital for Sick Children, Toronto, Canada.
Journal of Attention Disorders
|December 21, 2007
Summary
Methylphenidate (MPH) improved working memory (WM) manipulation in children with ADHD, but effects on storage varied. Comorbid anxiety (ANX) influenced MPH
Area of Science:
- Neuroscience
- Pediatric Psychiatry
- Cognitive Psychology
Background:
- Attention-Deficit/Hyperactivity Disorder (ADHD) is a common neurodevelopmental disorder.
- Working memory (WM) deficits are a core feature of ADHD.
- Comorbid anxiety (ANX) is frequent in children with ADHD and may affect treatment response.
Purpose of the Study:
- To investigate the effects of methylphenidate (MPH) on specific components of working memory (WM) in children with ADHD.
- To determine if MPH differentially impacts WM in children with ADHD and comorbid anxiety (ANX).
Main Methods:
- A randomized, double-blind, placebo-controlled, crossover trial was conducted.
- 130 children (aged 6-12) with ADHD participated, 32% with comorbid ANX.
- Four WM measures assessed information storage and manipulation across auditory-verbal and visual-spatial modalities.
Main Results:
- MPH enhanced auditory-verbal manipulation in children with ADHD without ANX.
- MPH improved visual-spatial manipulation in both ADHD groups (with and without ANX).
- Beneficial effects of MPH on visual-spatial storage were observed only in children without ANX.
Conclusions:
- Methylphenidate's effects on working memory components in ADHD are nuanced and depend on processing demands and comorbid anxiety.
- Findings suggest that comorbid anxiety influences individual differences in MPH treatment response for ADHD.
- These insights may guide more personalized treatment strategies for children with ADHD.
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