Spatiotemporal profile of peri-saccadic contrast sensitivity

Sensitivity to luminance contrast is reduced just before and during saccades (saccadic suppression), whereas sensitivity to color contrast is unimpaired peri-saccadically and enhanced post-saccadically. The exact spatiotemporal map of these perceptual effects is as yet unknown. Here, we measured det...

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Bibliographic Details
Published in:Journal of vision (Charlottesville, Va.) Va.), 2011-12, Vol.11 (14), p.15-15
Main Authors: Knöll, Jonas, Binda, Paola, Morrone, M Concetta, Bremmer, Frank
Format: Article
Language:English
Subjects:
Adult
Contrast Sensitivity - physiology
Humans
Middle Aged
Photic Stimulation - methods
Saccades - physiology
Space Perception - physiology
Young Adult
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Summary:Sensitivity to luminance contrast is reduced just before and during saccades (saccadic suppression), whereas sensitivity to color contrast is unimpaired peri-saccadically and enhanced post-saccadically. The exact spatiotemporal map of these perceptual effects is as yet unknown. Here, we measured detection thresholds for briefly flashed Gaussian blobs modulated in either luminance or chromatic contrast, displayed at a range of eccentricities. Sensitivity to luminance contrast was reduced peri-saccadically by a scaling factor, which was almost constant across retinal space. Saccadic suppression followed a similar time course across all tested eccentricities and was maximal shortly after the saccade onset. Sensitivity to chromatic contrast was enhanced post-saccadically at all tested locations. The enhancement was not specifically linked to the execution of saccades, as it was also observed following a displacement of retinal images comparable to that caused by a saccade. We conclude that luminance and chromatic contrast sensitivities are subject to distinct modulations at the time of saccades, resulting from independent neural processes.
ISSN:1534-7362
1534-7362
DOI:10.1167/11.14.15