Anomalous global effects induced by 'blind' distractors in visual hemifield defects

Van der Stigchel, S; Nijboer, T C W; Bergsma, D P; Abegg, Mathias; Barton, J J S (2010). Anomalous global effects induced by 'blind' distractors in visual hemifield defects. Brain and cognition, 74(1), pp. 66-73. Elsevier Science 10.1016/j.bandc.2010.06.006

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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.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Department of Head Organs and Neurology (DKNS) > Clinic of Ophthalmology
UniBE Contributor:	Abegg, Mathias
Subjects:	600 Technology > 610 Medicine & health
ISSN:	0278-2626
Publisher:	Elsevier Science
Language:	English
Submitter:	Mathias Abegg
Date Deposited:	04 Oct 2013 14:12
Last Modified:	05 Dec 2022 14:02
Publisher DOI:	10.1016/j.bandc.2010.06.006
PubMed ID:	20637537
Web of Science ID:	000280944000009
URI:	https://boris.unibe.ch/id/eprint/2643 (FactScience: 205488)