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abstract = {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.},
affiliation = {EPFL},
author = {Petreska, Biljana and Billard, Aude and Hermsdörfer,
Joachim and Goldenberg, Georg},
details = {http://infoscience.epfl.ch/record/140317},
documenturl = {http://infoscience.epfl.ch/record/140317/files/Petreska%20et%20al.%20Revisiting%20callosal%20apraxia.pdf},
doi = {doi:10.1016/j.neuropsychologia.2010.04.025},
issn = {0028-3932},
journal = {Neuropsychologia},
keywords = {apraxia; imitation of meaningless gestures;
lateralization; hemisphere specialization; corpus
number = {9},
oai-id = {oai:infoscience.epfl.ch:140317},
oai-set = {article; fulltext-public; fulltext},
pages = {2509--2516},
publisher = {Elsevier},
review = {REVIEWED},
status = {PUBLISHED},
submitter = {115671; 128701},
title = {Revisiting a study of callosal apraxia: {T}he right
hemisphere can imitate the orientation but not the
position of the hand },
unit = {LASA},
url = { },
volume = {48},
year = 2010

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