Spatiotemporal profile of peri-saccadic contrast sensitivity

Jonas Knöll, Paola Binda, M. Concetta Morrone, Frank Bremmer

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)1-12
Number of pages12
JournalJournal of Vision
Volume11
Issue number14
DOIs
Publication statusPublished - 2011

Keywords

  • Active vision
  • Contrast sensitivity
  • Eye movements
  • Peri-saccadic sensitivity

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems

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