Document Detail

Quantitative assessment of disparity vergence components.
MedLine Citation:
PMID:  3957575     Owner:  NLM     Status:  MEDLINE    
Earlier evidence suggests qualitatively that at least two control modes may mediate a single vergence response. Thus, in a vergence response to step disparity, the transient component drives the initial fast dynamic portion of the response, while the sustained component maintains the latter slower portion of the response. The authors extended this hypothesis by quantitatively defining the stimulus pattern and dynamics that elicit this dichotomous behavior. The disparity target consisted of vertical lines 2 deg in height presented to each eye. Ramp disparity velocities ranged from 0.7 deg/sec to 36 deg/sec with amplitude of up to 4 deg. Photoelectric recordings of eye movements from both eyes were subtracted to give the vergence response. Fast and slow ramp stimulus velocities were found to elicit transient and sustained component responses respectively. In addition, the finding of staircase-like responses to fast ramp stimuli has strong implications on control mechanisms, indicating a sampling process in the transient component of the disparity vergence system.
J L Semmlow; G K Hung; K J Ciuffreda
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Investigative ophthalmology & visual science     Volume:  27     ISSN:  0146-0404     ISO Abbreviation:  Invest. Ophthalmol. Vis. Sci.     Publication Date:  1986 Apr 
Date Detail:
Created Date:  1986-05-13     Completed Date:  1986-05-13     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  7703701     Medline TA:  Invest Ophthalmol Vis Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  558-64     Citation Subset:  IM; S    
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MeSH Terms
Eye Movements*
Models, Neurological
Vision, Ocular / physiology*
Visual Pathways / physiology

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