Document Detail


Intrabeat relationship of postrotatory nystagmus in normal subjects.
MedLine Citation:
PMID:  3976398     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Intrabeat relationships between duration, amplitude and velocity of the slow phase of nystagmus and between amplitudes of the fast and slow phase of nystagmus were analysed from postrotatory responses in 10 normal subjects, using linear regression analysis. For 5 subjects, the tests were repeated five times. Highly significant correlation was found between velocity and amplitude of the slow phase in 9 of 10 subjects, whereas in one subject it was less significant. All subjects exhibited a significant correlation between velocity and duration of the slow phases. These intrabeat relationships were repeatable and representative for each individual. Highly significant correlation was found between amplitudes of the slow and fast phases of nystagmus in all subjects. No interindividual differences in these variables could be observed. The results indicate that the end-point of the slow phase of vestibular nystagmus in darkness is controlled by positional and durational corollary circuitries. The positional signal in displacement circuitry is probably derived by integration of the velocity signals from the labyrinths. The durational circuitry is presumably more dominant at high nystagmus velocities in order to permit sufficient time for fixation.
Authors:
I Pyykkö; A I Dahlen
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Acta oto-laryngologica     Volume:  99     ISSN:  0001-6489     ISO Abbreviation:  Acta Otolaryngol.     Publication Date:    1985 Jan-Feb
Date Detail:
Created Date:  1985-04-02     Completed Date:  1985-04-02     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370354     Medline TA:  Acta Otolaryngol     Country:  SWEDEN    
Other Details:
Languages:  eng     Pagination:  74-82     Citation Subset:  IM; S    
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MeSH Terms
Descriptor/Qualifier:
Adult
Electrooculography
Eye Movements
Humans
Middle Aged
Nystagmus, Physiologic*
Regression Analysis
Rotation

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