Document Detail

Post-suppression vestibulo-ocular reflex in man: visual and non-visual mechanisms.
MedLine Citation:
PMID:  3875500     Owner:  NLM     Status:  MEDLINE    
The vestibulo-ocular reflex (VOR) was intermittently suppressed by fixating a head-fixed target (light on: 9 s; darkness: 2 s) during whole-body (60-100 deg/s peak; 0.01-0.17 Hz) sinusoidal and triangular oscillation about the vertical axis for about 2 min. Eye movements associated with intervals of darkness at different phases of body oscillation were stimulus-locked averaged, thereby estimating the "post-suppression VOR". The gain ( (eye velocity)/(head velocity) ) of the post-suppression VOR was generally 26-50% of the normal gain in maintained darkness. During sinusoidal body oscillation, the phase lead of the post-suppression VOR equalled or, at low frequencies, appeared to exceed the normal lead in maintained darkness. When the light was permanently extinguished after 2 min of intermittent suppression, an initially reduced VOR rapidly (e.g., 0.4 s) appeared and required 6-30 s to build up to normal again. These observations indicated that visual suppression of the VOR dissipated in darkness with rapid and slow components. During 0.17 Hz, 60 deg/s sinusoidal oscillation, the rapid (perhaps visual) component was responsible for 1/3, and the slow (perhaps non-visual) component for 2/3, of all suppressive effects.
B N Segal
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Experimental brain research     Volume:  59     ISSN:  0014-4819     ISO Abbreviation:  Exp Brain Res     Publication Date:  1985  
Date Detail:
Created Date:  1985-10-24     Completed Date:  1985-10-24     Revised Date:  2013-12-13    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  524-32     Citation Subset:  IM; S    
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MeSH Terms
Adaptation, Ocular
Middle Aged
Neural Inhibition
Nystagmus, Physiologic*
Photic Stimulation
Time Factors
Vestibule, Labyrinth / physiology*

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