Document Detail

Eye-head coordination in the guinea pig I. Responses to passive whole-body rotations.
MedLine Citation:
PMID:  20686891     Owner:  NLM     Status:  MEDLINE    
Vestibular reflexes act to stabilize the head and eyes in space during locomotion. Head stability is essential for postural control, whereas retinal image stability enhances visual acuity and may be essential for an animal to distinguish self-motion from that of an object in the environment. Guinea pig eye and head movements were measured during passive whole-body rotation in order to assess the efficacy of vestibular reflexes. The vestibulo-ocular reflex (VOR) produced compensatory eye movements with a latency of approximately 7 ms that compensated for 46% of head movement in the dark and only slightly more in the light (54%). Head movements, in response to abrupt body rotations, also contributed to retinal stability (21% in the dark; 25% in the light) but exhibited significant variability. Although compensatory eye velocity produced by the VOR was well correlated with head-in-space velocity, compensatory head-on-body speed and direction were variable and poorly correlated with body speed. The compensatory head movements appeared to be determined by passive biomechanical (e.g., inertial effects, initial tonus) and active mechanisms (the vestibulo-collic reflex or VCR). Chemically induced, bilateral lesions of the peripheral vestibular system abolished both compensatory head and eye movement responses.
N Shanidze; A H Kim; Y Raphael; W M King
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2010-08-05
Journal Detail:
Title:  Experimental brain research     Volume:  205     ISSN:  1432-1106     ISO Abbreviation:  Exp Brain Res     Publication Date:  2010 Sep 
Date Detail:
Created Date:  2010-08-18     Completed Date:  2010-12-02     Revised Date:  2014-09-21    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  395-404     Citation Subset:  IM    
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MeSH Terms
Biomechanical Phenomena
Eye Movements / physiology*
Guinea Pigs
Head Movements / physiology*
Neck / physiology
Psychomotor Performance / physiology*
Reflex, Stretch / physiology
Reflex, Vestibulo-Ocular / physiology
Retina / physiology
Vestibule, Labyrinth / physiology
Grant Support
P30 NDC005188-07//PHS HHS; R21 DC009293/DC/NIDCD NIH HHS; R21 DC009293-02/DC/NIDCD NIH HHS; R21-DC008607-01/DC/NIDCD NIH HHS; T32 DC000011-30/DC/NIDCD NIH HHS

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