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ERIC Number: EJ892468
Record Type: Journal
Publication Date: 2010-Oct
Pages: 8
Abstractor: As Provided
Reference Count: 0
ISSN: ISSN-0278-2626
Anomalous Global Effects Induced by "Blind" Distractors in Visual Hemifield Defects
Van der Stigchel, S.; Nijboer, T. C. W.; Bergsma, D. P.; Abegg, M.; Barton, J. J. S.
Brain and Cognition, v74 n1 p66-73 Oct 2010
Previous research has revealed that a stimulus presented in the blind visual field of participants with visual hemifield defects can evoke oculomotor competition, in the absence of awareness. Here we studied three cases to determine whether a distractor in a blind hemifield would be capable of inducing a "global effect", a shift of saccade endpoint when target and distractor are close to each other, in participants with lesions of the optic radiations or striate cortex. We found that blind field distractors significantly shifted saccadic endpoints in two of three participants with lesions of either the striate cortex or distal optic radiations. The direction of the effect was paradoxical, however, in that saccadic endpoints shifted "away" from blind field distractors, whereas endpoints shifted "towards" distractors in the visible hemifields, which is the normal global effect. These results provide further evidence that elements presented in the blind visual field can generate modulatory interactions in the oculomotor system, which may differ from interactions in normal vision. (Contains 3 tables and 5 figures.)
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A