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

Brain and Cognition
Stefan Van der StigchelJason J S Barton

Abstract

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.

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Apr 18, 2008·Journal of Cognitive Neuroscience·Stefan Van der StigchelJason J S Barton
Jun 5, 2008·Brain : a Journal of Neurology·Geraint Rees

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Citations

Mar 5, 2011·Experimental Brain Research·S Van der StigchelJ Theeuwes
Sep 18, 2012·Neuropsychologia·D P CareyA Sahraie
Apr 24, 2012·Vision Research·S Van der StigchelT C W Nijboer
Nov 26, 2010·Current Opinion in Neurology·Jason J S Barton

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