| Perceived motion direction during smooth pursuit eye movements. | |
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MedLine Citation:
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PMID: 15856207 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Although many studies have been devoted to motion perception during smooth pursuit eye movements, relatively little attention has been paid to the question of whether the compensation for the effects of these eye movements is the same across different stimulus directions. The few studies that have addressed this issue provide conflicting conclusions. We measured the perceived motion direction of a stimulus dot during horizontal ocular pursuit for stimulus directions spanning the entire range of 360 degrees. The stimulus moved at either 3 or 8 degrees/s. Constancy of the degree of compensation was assessed by fitting the classical linear model of motion perception during pursuit. According to this model, the perceived velocity is the result of adding an eye movement signal that estimates the eye velocity to the retinal signal that estimates the retinal image velocity for a given stimulus object. The perceived direction depends on the gain ratio of the two signals, which is assumed to be constant across stimulus directions. The model provided a good fit to the data, suggesting that compensation is indeed constant across stimulus direction. Moreover, the gain ratio was lower for the higher stimulus speed, explaining differences in results in the literature. |
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Authors:
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Jan L Souman; Ignace Th C Hooge; Alexander H Wertheim |
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Publication Detail:
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Type: Comparative Study; Journal Article Date: 2005-04-27 |
Journal Detail:
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Title: Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale Volume: 164 ISSN: 0014-4819 ISO Abbreviation: Exp Brain Res Publication Date: 2005 Jul |
Date Detail:
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Created Date: 2005-07-19 Completed Date: 2005-12-15 Revised Date: 2009-11-11 |
Medline Journal Info:
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Nlm Unique ID: 0043312 Medline TA: Exp Brain Res Country: Germany |
Other Details:
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Languages: eng Pagination: 376-86 Citation Subset: IM |
Affiliation:
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Helmholtz Institute, Department of Psychonomics, Utrecht University, The Netherlands. j.l.souman@fss.uu.nl |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adolescent Adult Female Humans Male Models, Statistical Motion Perception / physiology* Orientation* Photic Stimulation / methods Psychophysics / methods Pursuit, Smooth / physiology* |
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