An unbiased measure of the contributions of chroma and luminance to saccadic suppression of displacement.

Full Abstract

Perception of image displacement is suppressed during saccadic eye movements. We probed the source of saccadic suppression of displacement by testing whether it selectively affects chromatic- or luminance-based motion information. Human subjects viewed a stimulus in which chromatic and luminance cues provided conflicting information about displacement direction. Apparent motion occurred during either fixation or a 19.5 degree saccade. Subjects detected motion and discriminated displacement direction in each trial. They reported motion in over 90% of fixation trials and over 70% of saccade trials. During fixation, the probability of perceiving the direction carried by chromatic cues decreased as luminance contrast increased. During saccades, subjects tended to perceive the direction indicated by luminance cues when luminance contrast was high. However, when luminance contrast was low, subjects showed no preference for the chromatic- or luminance-based direction. Thus magnocellular channels are suppressed, while stimulation of parvocellular channels is below threshold, so that neither channel drives motion perception during saccades. These results confirm that magnocellular inhibition is the source of saccadic suppression.

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Author information

Author/s: Anand, Sulekha (S); Bridgeman, Bruce (B);

Affiliation: Department of Biological Sciences, San Jose State University, One Washington Square, San Jose, CA 95192-0100, USA, sanand(-atsign-)email.sjsu.edu

Journal and publication information

Publication Type: Journal Article

Journal: Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale (Exp Brain Res), published in Germany. (Language: eng)

Reference: 2002-Feb; vol 142 (issue 3) : pp 335-41

Dates: Created 2002/03/06; Completed 2002/04/25; Revised 2008/02/15;

PMID: 11819041, status: MEDLINE (last retrieval date: 12/26/2008)

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Adult
Brain - physiology
Color Perception - physiology
Contrast Sensitivity - physiology
Cues
Female
Fixation, Ocular - physiology
Humans
Male

Male
Motion Perception - physiology
Neural Inhibition - physiology
Neuropsychological Tests
Photic Stimulation - methods
Psychomotor Performance - physiology
Reaction Time
Saccades - physiology
Visual Pathways - physiology

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