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The role of the corpus callosum in the representation of lateral orientation

The role of the corpus callosum in the representation of lateral orientation
The role of the corpus callosum in the representation of lateral orientation
How do people recognize objects when they face in a novel lateral (left/right) orientation? The results of three experiments with a split-brain patient, who has a totally nonfunctional corpus callosum, demonstrate that the corpus callosum cannot play a critical role in allowing one to recognize mirror-reversed objects. First, both cerebral hemispheres could recognize mirror-reversed versions of pictures as accurately as the original renditions in an incidental memory task. Second, when asked to decide whether pictures faced the same way that they had originally, neither hemisphere performed better than chance in an incidental memory task—suggesting that the shape representations in the hemispheres do not specify lateral orientation. Third, neither hemisphere exhibited "priming" for lateral orientation, as assessed in an "object decision task", and only the left hemisphere exhibited priming for encoding the shape (independent of its lateral orientation).
0028-3932
675-686
Kosslyn, Stephen M.
eebd0b70-3076-4e63-8dcc-6578f4222452
LeSueur, L. Lynn
8bc151de-c2d2-48bd-b382-c53f7b5f50cf
Dror, Itiel E.
4d907da2-0a2e-41ed-b927-770a70a35c71
Gazzaniga, Michael S.
e834d5f6-9dec-46be-a60c-41d7991a92e4
Kosslyn, Stephen M.
eebd0b70-3076-4e63-8dcc-6578f4222452
LeSueur, L. Lynn
8bc151de-c2d2-48bd-b382-c53f7b5f50cf
Dror, Itiel E.
4d907da2-0a2e-41ed-b927-770a70a35c71
Gazzaniga, Michael S.
e834d5f6-9dec-46be-a60c-41d7991a92e4

Kosslyn, Stephen M., LeSueur, L. Lynn, Dror, Itiel E. and Gazzaniga, Michael S. (1993) The role of the corpus callosum in the representation of lateral orientation. Neuropsychologia, 31 (7), 675-686. (doi:10.1016/0028-3932(93)90139-Q).

Record type: Article

Abstract

How do people recognize objects when they face in a novel lateral (left/right) orientation? The results of three experiments with a split-brain patient, who has a totally nonfunctional corpus callosum, demonstrate that the corpus callosum cannot play a critical role in allowing one to recognize mirror-reversed objects. First, both cerebral hemispheres could recognize mirror-reversed versions of pictures as accurately as the original renditions in an incidental memory task. Second, when asked to decide whether pictures faced the same way that they had originally, neither hemisphere performed better than chance in an incidental memory task—suggesting that the shape representations in the hemispheres do not specify lateral orientation. Third, neither hemisphere exhibited "priming" for lateral orientation, as assessed in an "object decision task", and only the left hemisphere exhibited priming for encoding the shape (independent of its lateral orientation).

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Published date: 1993

Identifiers

Local EPrints ID: 18344
URI: https://eprints.soton.ac.uk/id/eprint/18344
ISSN: 0028-3932
PURE UUID: 93aaee01-64d4-4d9c-95fc-b57742d2f0d6

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Date deposited: 10 Jan 2006
Last modified: 17 Jul 2017 16:36

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