Grasping Motor Impairments in Autism: Not Action Planning but Movement Execution is Deficient |
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Authors: | Astrid M. B. Stoit Hein T. van Schie Dorine I. E. Slaats-Willemse Jan K. Buitelaar |
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Affiliation: | 1. Karakter Child and Adolescent Psychiatry, P.O. Box 40244, 8004 DE, Zwolle, The Netherlands 2. Behavioural Science Institute, Radboud University Nijmegen, P.O. Box 9104, 6500 HE, Nijmegen, The Netherlands 3. Karakter Child and Adolescent Psychiatry, University Centre, Reinier Postlaan 12, 6525 GC, Nijmegen, The Netherlands 4. Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen Medical Centre, P.O. Box 9101, 6500 HB, Nijmegen, The Netherlands
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Abstract: | Different views on the origin of deficits in action chaining in autism spectrum disorders (ASD) have been posited, ranging from functional impairments in action planning to internal models supporting motor control. Thirty-one children and adolescents with ASD and twenty-nine matched controls participated in a two-choice reach-to-grasp paradigm wherein participants received cueing information indicating either the object location or the required manner of grasping. A similar advantage for location cueing over grip cueing was found in both groups. Both accuracy and reaction times of the ASD group were indistinguishable from the control group. In contrast, movement times of the ASD group were significantly delayed in comparison with controls. These findings suggest that movement execution rather than action planning is deficient in ASD, and that deficits in action chaining derive from impairments in internal action models supporting action execution. |
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