Document Detail

Transfer of optokinetic activity to vestibular nystagmus.
MedLine Citation:
PMID:  3260439     Owner:  NLM     Status:  MEDLINE    
Transfer of activity generated by prior optokinetic (OK) stimuli of one minute's duration to nystagmus induced in darkness by a subsequent vestibular stimulus consisting of step velocities to and from 40 degrees/s-1 was studied in 10 normal subjects. Four types of OK stimuli were used: (a) full field 'passive'; (b) full field 'active'; (c) full field in the presence of optic fixation, and (d) small OK drum stimulation. Transfer (T) was evident under all conditions and resulted in an enhancement of the vestibulo-ocular (VO) response when activity from the two stimuli were in the same direction (S) and a suppression when in the opposite (O). Expressed by the equation: Formula See Text. the respective transfer values obtained for the above conditions were (a) 66%, (b) 58%, (c) 22%, and (d) 54%. In all tests, rightward OK drum movement was more effective than leftward. In respect of passive OKN the resultant response can be well represented as the algebraic summation of the expected optokinetic after-nystagmus (OKAN) and the VO response, though opposing OKAN is more effective than enhancing. Passive OKN is more effective than active and this can be accounted for by the small contribution made by retinal slip in the former (the indirect path). Surprisingly, the small drum proved almost as effective as active OKN in terms of transfer. Fixation in the presence of full-field OK stimuli induces a non-directionally specific depression of the subsequent VO response, implying that retinal slip could contribute to the mechanism of VO response suppression.
H J Barratt; J D Hood
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Acta oto-laryngologica     Volume:  105     ISSN:  0001-6489     ISO Abbreviation:  Acta Otolaryngol.     Publication Date:    1988 Mar-Apr
Date Detail:
Created Date:  1988-08-08     Completed Date:  1988-08-08     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0370354     Medline TA:  Acta Otolaryngol     Country:  SWEDEN    
Other Details:
Languages:  eng     Pagination:  318-27     Citation Subset:  IM; S    
Medical Research Council Neuro-Otology Unit, Institute of Neurology, National Hospital, London, England.
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MeSH Terms
Middle Aged
Nystagmus, Physiologic*
Photic Stimulation
Semicircular Canals / physiology
Vestibule, Labyrinth / physiology*

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