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Journal of Autism and Developmental Disorders

, Volume 43, Issue 12, pp 2793–2806 | Cite as

Grasping Motor Impairments in Autism: Not Action Planning but Movement Execution is Deficient

  • Astrid M. B. Stoit
  • Hein T. van SchieEmail author
  • Dorine I. E. Slaats-Willemse
  • Jan K. Buitelaar
Original Paper

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.

Keywords

Autism Motor deficit Action chaining Feedforward model Action planning Movement execution 

Notes

Acknowledgments

This research was supported by the EU-Project “Joint Action Science and Technology” (IST-FP6-003747). We thank Pascal de Water, Norbert Hermesdorf and Kees Rap for their technical assistance. We thank Monique van den Berg and Madelon Riem for their help with collecting the data.

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Astrid M. B. Stoit
    • 1
  • Hein T. van Schie
    • 2
    Email author
  • Dorine I. E. Slaats-Willemse
    • 3
  • Jan K. Buitelaar
    • 3
    • 4
  1. 1.Karakter Child and Adolescent PsychiatryZwolleThe Netherlands
  2. 2.Behavioural Science InstituteRadboud University NijmegenNijmegenThe Netherlands
  3. 3.Karakter Child and Adolescent PsychiatryUniversity CentreNijmegenThe Netherlands
  4. 4.Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and BehaviourRadboud University Nijmegen Medical CentreNijmegenThe Netherlands

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