Document Detail


Asymmetrical perception of motion smear in infantile nystagmus.
MedLine Citation:
PMID:  19010344     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Normal observers perceive less motion smear if a target moves in the opposite direction of a smooth eye movement than if the target moves to produce the same retinal image speed in the same direction as the eye movement. This study investigated whether a similar asymmetrical attenuation of perceived motion smear occurs in observers with infantile nystagmus (IN). Observers (N=3) viewed a laser spot that moved for 100 or 125ms to the right or left at a speed between 5 and 60 degrees /s during the slow phase of jerk IN. After each trial, the observer adjusted the length of a bright line to match the extent of the perceived smear. Across observers, the average duration of perceived smear was 39 and 106ms, respectively, for relative motion of the laser spot in the opposite vs. the same direction as the IN slow phase. In one observer with periodic alternating nystagmus, the direction of spot motion that produced less perceived smear reversed with an alternation in the direction of the IN slow phase. The reduction of perceived motion smear for relative target motion in the opposite direction of IN slow phases is attributed to extra-retinal signals that accompany IN. As during normal eye movements, the reduction of perceived smear for this direction of relative motion should foster the perception of clarity in the stationary visual world.
Authors:
Harold E Bedell; Jianliang Tong
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2008-12-03
Journal Detail:
Title:  Vision research     Volume:  49     ISSN:  1878-5646     ISO Abbreviation:  Vision Res.     Publication Date:  2009 Jan 
Date Detail:
Created Date:  2009-01-05     Completed Date:  2009-10-09     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  262-7     Citation Subset:  IM    
Affiliation:
College of Optometry, University of Houston, TX 77204-2020, USA. HBedell@Optometry.uh.edu
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MeSH Terms
Descriptor/Qualifier:
Eye Movement Measurements
Humans
Middle Aged
Motion Perception / physiology*
Nystagmus, Congenital / physiopathology,  psychology*
Photic Stimulation / methods
Psychophysics
Visual Acuity
Grant Support
ID/Acronym/Agency:
P30 EY07551/EY/NEI NIH HHS; R01 EY05068,/EY/NEI NIH HHS

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


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