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  4. Revisiting a study of callosal apraxia: The right hemisphere can imitate the orientation but not the position of the hand
 
research article

Revisiting a study of callosal apraxia: The right hemisphere can imitate the orientation but not the position of the hand

Petreska, Biljana  
•
Billard, Aude  orcid-logo
•
Hermsdörfer, Joachim
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2010
Neuropsychologia

Callosal disconnection can reveal asymmetrical contributions of the two brain hemispheres to praxis. In this paper, we revisit a study of a patient with callosal disconnection (Goldenberg et al., 2001, Neuropsychologia, 39:1432–1443), who perfectly imitated meaningless gestures when imitation was controlled only by the left hemisphere, but was severely impaired when the right hemisphere was in charge of motor control. We decomposed the gestures into a set of geometric variables that were to be reproduced, such as the orientation of the hand and the position of contact between the hand and the face. Whereas orientation of the hand in extrinsic coordinates was replicated correctly by both hemispheres, only the left hemisphere reproduced correctly the position of contact between the hand and the face. This goal-dissociation as well as several partial perseveration errors speak against the hypothesis of a direct route from perception to motor replication of gestures, as interruption of a direct route would probably impair all the features of the gesture. We speculate that incorrect coordination between the reproductions of multiple goals may be the core deficit underlying callosal apraxia.

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Type
research article
DOI
10.1016/j.neuropsychologia.2010.04.025
Web of Science ID

WOS:000280573300011

Author(s)
Petreska, Biljana  
Billard, Aude  orcid-logo
Hermsdörfer, Joachim
Goldenberg, Georg
Date Issued

2010

Publisher

Elsevier

Published in
Neuropsychologia
Volume

48

Issue

9

Start page

2509

End page

2516

Subjects

apraxia

•

imitation of meaningless gestures

•

lateralization

•

hemisphere specialization

•

corpus callosum

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LASA  
Available on Infoscience
July 29, 2009
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/41825
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