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ERIC Number: EJ813115
Record Type: Journal
Publication Date: 2007-Sep
Pages: 9
Abstractor: As Provided
Reference Count: 0
ISSN: ISSN-0021-9630
Effects of Methylphenidate on Working Memory Components: Influence of Measurement
Bedard, Anne-Claude; Jain, Umesh; Hogg-Johnson, Sheilah; Tannock, Rosemary
Journal of Child Psychology and Psychiatry, v48 n9 p872-880 Sep 2007
Background: To investigate the effects of methylphenidate (MPH) on components of working memory (WM) in attention-deficit hyperactivity disorder (ADHD) and determine the responsiveness of WM measures to MPH. Methods: Participants were a clinical sample of 50 children and adolescents with ADHD, aged 6 to 16 years old, who participated in an acute randomized, double-blind, placebo-controlled, crossover trial with single challenges of three MPH doses. Four components of WM were investigated, which varied in processing demands (storage versus manipulation of information) and modality (auditory-verbal; visual-spatial), each of which was indexed by a minimum of two separate measures. Results: MPH improved the ability to store visual-spatial information irrespective of instrument used, but had no effects on the storage of auditory-verbal information. By contrast, MPH enhanced the ability to manipulate both auditory-verbal and visual-spatial information, although effects were instrument specific in both cases. Conclusions: MPH effects on WM are selective: they vary as a function of WM component and measurement.
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A