Motion defined exclusively by second-order characteristics does not evoke optokinetic nystagmus
- 1 December 1992
- journal article
- research article
- Published by Maximum Academic Press in Visual Neuroscience
- Vol. 9 (6) , 565-570
- https://doi.org/10.1017/s0952523800001802
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
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