Document Detail

Contribution of chromatic mechanisms to the production of small-field optokinetic nystagmus (OKN) in normals and strabismics.
MedLine Citation:
PMID:  8759469     Owner:  NLM     Status:  MEDLINE    
The contribution of chromatic mechanisms to motion processing is currently debated. Although OKN as a measure of motion processing has been employed for chromatic stimuli, the contribution of chromatic mechanisms to the production of OKN has not been assessed directly. We measured voluntary-pursuit and involuntary-stare OKN responses to drifting patterns defined by colors modulated in a cone based color space which isolates luminance and color mechanisms. Results show that OKN responses are reduced for isoluminant stimuli, particularly for the stare conditions. The greatest reduction in responses occur for isoluminance stimuli that isolate the S cones. These results suggest that the chromatic mechanisms may have reduced input to the neural substrate that produces involuntary-stare OKN or that stare OKN has different temporal characteristics when stimulated by chromatic and luminance mechanisms. We also measured OKN asymmetries in several convergent strabismics in response to isoluminant and luminance patterns and compared their response to previous reports of horizontal OKN asymmetries in normal neonate infants. The results question the validity of either the modeling of OKN asymmetries in strabismus as incomplete development or the comparison of adult eye movement records evaluated with criteria for OKN with psychophysical forced choice evaluation of ocular drift in infants.
M A Crognale; C M Schor
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Vision research     Volume:  36     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  1996 Jun 
Date Detail:
Created Date:  1996-10-03     Completed Date:  1996-10-03     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1687-98     Citation Subset:  IM; S    
University of Washington, Department of Psychology, Seattle 98195, USA.
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MeSH Terms
Color Perception / physiology*
Eye Movements
Middle Aged
Motion Perception / physiology
Nystagmus, Optokinetic / physiology*
Pattern Recognition, Visual / physiology
Sensory Thresholds / physiology
Strabismus / physiopathology*
Time Factors
Grant Support

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

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