Document Detail


Dynamic effects on the subjective visual vertical after roll rotation.
MedLine Citation:
PMID:  18497358     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We investigated in normal human subjects how semicircular canal and otolith signals interact in the estimation of the subjective visual vertical after constant velocity or constant acceleration roll tilt. In the constant velocity paradigm, subjects were rotated in darkness at +/-60 degrees/s for five complete cycles before being stopped in one of seven orientations ranging from 0 to +/-90 degrees (right/left ear down). In the constant acceleration paradigm, subjects were rotated with an acceleration of +30 or -30 degrees/s2 to the same seven end positions between -90 and +90 degrees , by way of passing once through the upside-down position. The subjective visual vertical was assessed by measuring the setting of a luminous line that appeared at different test delays after stop rotation in otherwise complete darkness. The data suggest that gravitational jerk signals generated by otolith-semicircular canal interactions and/or carried by phasic otolith signals are responsible for the observed transient bias in the estimation of the subjective visual vertical. This transient bias depended on both rotation and tilt direction after constant velocity rotations, but was almost abolished following constant acceleration rotations.
Authors:
Erika N Lorincz; Bernhard J M Hess
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-05-21
Journal Detail:
Title:  Journal of neurophysiology     Volume:  100     ISSN:  0022-3077     ISO Abbreviation:  J. Neurophysiol.     Publication Date:  2008 Aug 
Date Detail:
Created Date:  2008-08-13     Completed Date:  2008-11-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0375404     Medline TA:  J Neurophysiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  657-69     Citation Subset:  IM    
Affiliation:
Department of Neurology, University Hospital Zurich, Zurich, Switzerland.
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MeSH Terms
Descriptor/Qualifier:
Adult
Analysis of Variance
Gravitation
Humans
Middle Aged
Models, Biological
Motion Perception
Nonlinear Dynamics*
Orientation / physiology*
Otolithic Membrane / physiology*
Reflex, Vestibulo-Ocular / physiology*
Rotation*
Semicircular Canals / physiology*
Time Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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