Abstract:
:In a tachistoscopic visual search task, the effects of ipsi- and contralateral distractors on target search were investigated in two complete commissurotomy patients. Pop-out distractors slowed the search for contralateral targets in both patients, i.e. search was not independent in both hemifields. In normals, we previously observed an extinction-like asymmetry in that distractors in the right visual hemifield interfered with target search in the left visual hemifield, but not vice versa. This pattern was also found in one of our patients, N.G., whereas the other, L.B., showed a reversed laterality effect. While N.G. is able to transfer visual shape information between hemispheres, L.B. is not. The data suggest that the reversal of the contralateral distractor asymmetry in L.B. is due to the disruption of ipsilateral visual input to the right hemisphere.
journal_name
Neuropsychologiajournal_title
Neuropsychologiaauthors
Pollmann S,Zaidel Edoi
10.1016/s0028-3932(97)00172-3subject
Has Abstractpub_date
1998-08-01 00:00:00pages
763-74issue
8eissn
0028-3932issn
1873-3514pii
S0028-3932(97)00172-3journal_volume
36pub_type
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