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Motion defined exclusively by second-order characteristics does not evoke optokinetic nystagmus

Published online by Cambridge University Press:  02 June 2009

Laurence R. Harri  and
Andrew T. Smith
Laurence R. Harri
Affiliation:
Department of Psychology, York University, Toronto, Ontario, M3J 1P3, Canada
Andrew T. Smith
Affiliation:
Department of Psychology, University of Wales College of Cardiff, Cardiff, CF1 3YG, UK
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Abstract

We showed high-contrast, second-order motion stimuli to subjects whilst recording their horizontal eye movements. These stimuli were very poor at evoking optokinetic nystagmus. Smooth-pursuit eye movements and fixation were reduced by a masking band ±2.5 deg above and below an imaginary fixation point. First-order stimuli evoked vigorous optokinetic nystagmus (OKN) under identical conditions and also when matched for apparent contrast. These findings are discussed in terms of the site of detection of second-order motion.

Keywords

Motion perceptionOptokinetic nystagmusSecond-order motionVisual noise
Type
Research Article
Information
Visual Neuroscience , Volume 9 , Issue 6 , December 1992 , pp. 565 - 570
Copyright
Copyright © Cambridge University Press 1992

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