Visual Evoked Responses as a Function of Light Intensity in Down's Syndrome and Nonretarded Subjects

ABSTRACT Occipital and central averaged visual evoked responses (VERs) were recorded from nonretarded and Down's syndrome (DS) subjects. Three different light intensities were used, all below levels of stimulation used in previous studies. Overall results showed that DS subjects had significant...

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Bibliographic Details
Published in:Psychophysiology 1975-07, Vol.12 (4), p.416-422
Main Authors: Gliddon, J. B., Busk, Jytte, Galbraith, Gary C.
Format: Article
Language:English
Subjects:
Adolescent
Adult
Down Syndrome - physiopathology
Down's syndrome
Evoked Potentials
Hemispheric asymmetry
Humans
Light intensity
Lighting
Male
Reaction Time
Visual evoked response
Visual Perception
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Summary:ABSTRACT Occipital and central averaged visual evoked responses (VERs) were recorded from nonretarded and Down's syndrome (DS) subjects. Three different light intensities were used, all below levels of stimulation used in previous studies. Overall results showed that DS subjects had significantly larger VER perimeters and longer VER latencies, while nonretarded subjects had significant VER asymmetry in the occipital recording (left> right) at all three intensities, DS subjects showed a significantly greater increase in perimeter scores as a function of intensity, with the widest group separation occurring at the highest level of stimulation (43 phots). However, when VER latencies were measured, the widest group separation occurred at the lowest level of stimulation (0.43) phots. Moreover, the only evidence reported thus far for evoked response asymmetry in DS subjects occurred at the lowest light level, These results illustrate the importance of stimulus parameters in evoked potential studies of mental retardation.
ISSN:0048-5772
1469-8986
DOI:10.1111/j.1469-8986.1975.tb00015.x