Document Detail


Electrophysiological assessment of the human depth-perception threshold.
MedLine Citation:
PMID:  3678854     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The cortical response to stereoscopic stimuli was measured as a function of disparity using visual evoked potentials (VEP). The stereoscopic stimulus consisted of a dynamic random-dot pattern that portrayed a three-dimensional horizontal grating. Disparity of the grating was variable between 0 and 18 arc min, step size being 4.22 arc s. Evoked responses were recorded using a "random-sequence sweep technique." The VEP amplitude increased approximately linearly with the logarithm of disparity and allowed an estimation of the stereo threshold by linear extrapolation. The evoked potential estimates of the stereo threshold of 16 subjects were compared to psychophysically obtained thresholds. Several threshold-estimation techniques are discussed. Evoked potential and psychophysical threshold estimates had the lowest discrepancy when the VEP amplitude was linearly extrapolated to the logarithmic disparity axis. The difference between the evoked potential estimate and the psychophysical threshold was less than 20% in 56% of all cases; 16 of 18 cases (89%) agreed within a factor of 2.
Authors:
W Wesemann; H Klingenberger; B Rassow
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv für klinische und experimentelle Ophthalmologie     Volume:  225     ISSN:  0721-832X     ISO Abbreviation:  Graefes Arch. Clin. Exp. Ophthalmol.     Publication Date:  1987  
Date Detail:
Created Date:  1988-01-20     Completed Date:  1988-01-20     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8205248     Medline TA:  Graefes Arch Clin Exp Ophthalmol     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  429-36     Citation Subset:  IM; S    
Affiliation:
Medical Optics Laboratory, University Eye Clinic, Hamburg, Federal Republic of Germany.
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MeSH Terms
Descriptor/Qualifier:
Depth Perception / physiology*
Evoked Potentials, Visual
Humans
Myopia / physiopathology
Psychophysics
Sensory Thresholds
Visual Cortex / physiopathology

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


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