Evidence for Slowing as a Function of Index of Difficulty in Young Adults With Down Syndrome

MSL research field: 
Special populations
TitleEvidence for Slowing as a Function of Index of Difficulty in Young Adults With Down Syndrome
Publication TypeJournal Article
Year of Publication2009
AuthorsLam, MY, Hodges, NJ, Virji-Babul, N, Latash, ML
JournalAmerican Journal on Intellectual and Developmental Disabilities
Volume114
Issue6
Pagination411 - 426
Date Published11/2009
ISSN1944-7558
AbstractSpeed-accuracy trade-offs in persons with Down syndrome and typically developing controls were tested with a Fitts' task. Movement time scaled linearly with index of difficulty in both groups, and there were no accuracy differences. Persons with Down syndrome were slower than typically developing individuals. Regression analysis on movement time and index of difficulty showed a nearly two-fold higher regression coefficient and a nearly three-fold larger intercept value in the Down syndrome group. The dwell time on a target was much longer for Down syndrome persons but scaled with index of difficulty in about the same percentage for participants in both groups. Because of differences primarily related to scaling, we conclude that mechanisms of motor control are similar in Down syndrome and typically developing groups.
DOI10.1352/1944-7558-114.6.411
Short TitleAmerican Journal on Intellectual and Developmental Disabilities
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