Related Experiment Videos
Methylphenidate improves working memory and set-shifting in AD/HD: relationships to baseline memory capacity
Mitul A Mehta1, Ian M Goodyer, Barbara J Sahakian
1University of Cambridge, Department of Psychiatry, UK. mitul.mehta2@imperial.ac.uk
Journal of Child Psychology and Psychiatry, and Allied Disciplines
|February 26, 2004
Summary
Methylphenidate effectively improved cognitive functions like working memory and attention in boys with attention deficit/hyperactivity disorder (AD/HD). These improvements suggest targeted benefits for fronto-striatal pathways, potentially aiding ADHD symptom management.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Psychology
Background:
- Attention deficit/hyperactivity disorder (AD/HD) is often treated with catecholamine stimulant drugs.
- These medications modulate catecholamine levels, impacting cognitive functions such as attention and working memory (WM).
- Understanding methylphenidate's specific cognitive effects in AD/HD is crucial for optimizing treatment.
Purpose of the Study:
- To investigate the acute cognitive effects of methylphenidate in boys diagnosed with AD/HD.
- To assess the impact of methylphenidate on specific cognitive domains including attention, working memory, and executive functions.
- To explore potential relationships between cognitive performance and treatment response.
Main Methods:
- A double-blind, placebo-controlled study involving 14 boys (mean age 10.86 years) meeting DSM-IV AD/HD criteria.
- Administered an acute dose of methylphenidate (approx. 0.5 mg/kg) or placebo.
- Utilized the Cambridge Neuropsychological Test Automated Battery (CANTAB) to evaluate visuo-spatial memory, spatial WM, planning, visual-search, and attentional-set shifting.
Main Results:
- Methylphenidate significantly enhanced performance on spatial working memory, attentional-set shifting, and visual-search tasks.
- Correlations indicated a potential link between working memory capacity and improvements in spatial working memory.
- Impaired performance on attentional-set shifting under placebo was associated with increased errors in spatial working memory.
Conclusions:
- Methylphenidate may selectively improve cognitive functions reliant on fronto-striatal pathways, addressing core AD/HD-related difficulties.
- The findings suggest that methylphenidate can positively impact both cognitive deficits and clinical symptoms of AD/HD.
- Pre-treatment cognitive measures might predict individual responses to methylphenidate treatment.