Document Detail

Human horizontal optokinetic nystagmus elicited by the upper versus the lower visual fields.
MedLine Citation:
PMID:  2487639     Owner:  NLM     Status:  MEDLINE    
A 30-deg-high horizontally rotating random-dot display was presented to the central field, and with its more central edge at vertical eccentricities of 0, 2.5, 5, and 10 deg above or below the horizon. Stimulus velocities of 25-100 deg/s and two directions of motion were presented. The mean gain of the slow phases of optokinetic nystagmus (OKN) for five subjects was significantly higher when the stimulus was presented to the lower visual field than when the stimulus was presented to the upper field. This difference was most pronounced when the display was displaced 5 deg from the fovea and moving below 100 deg/s. Our results are consistent with existing psychophysical and physiological evidence for the superiority of the upper retina. In addition, four of the five observors showed significant directional asymmetries.
C M Murasugi; I P Howard
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Visual neuroscience     Volume:  2     ISSN:  0952-5238     ISO Abbreviation:  Vis. Neurosci.     Publication Date:  1989  
Date Detail:
Created Date:  1991-03-22     Completed Date:  1991-03-22     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8809466     Medline TA:  Vis Neurosci     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  73-9     Citation Subset:  IM    
Department of Psychology, York University, Ontario, Canada.
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MeSH Terms
Middle Aged
Nystagmus, Physiologic / physiology*
Photic Stimulation
Time Factors
Visual Fields*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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