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ApraxiaThe Cognitive side of motor control$
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Georg Goldenberg

Print publication date: 2013

Print ISBN-13: 9780199591510

Published to Oxford Scholarship Online: September 2013

DOI: 10.1093/acprof:oso/9780199591510.001.0001

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Body part specificity

Body part specificity

(p.99) Chapter 7 Body part specificity
Oxford University Press

Whereas defective imitation of hand postures is bound to left-hemisphere lesions, finger and leg postures are also disturbed by right-hemisphere lesions. This chapter proposes that body part specificity of impaired imitation derives from the interplay of body part coding and deployment of attention with the anatomical structures of proximal body parts, fingers, and legs. Whereas deployment of attention depends mainly on the integrity of the right hemisphere, body part coding is a contribution of the left parietal lobe. Body part coding enables decomposition of demonstrated gestures into distinct body parts and their spatial relationships. Recombination of these elements results in replication of the gesture. The sequence of decomposition and recombination makes body part coding a constituent of a “generative system” where a multitude of formations can be produced from combination of a limited number of elements.

Keywords:   imitation, body schema, attention, neglect, apraxia, motor control

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