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Electroretinograms (ERGs) and visual-evoked potentials (VEPs) elicited by pattern displacement

Published online by Cambridge University Press:  02 June 2009

Shuang Wu ,
John C. Armington  and
Adam Reeves
Shuang Wu
Affiliation:
Department of Psychology, Northeastern University, Boston
John C. Armington
Affiliation:
Department of Psychology, Northeastern University, Boston
Adam Reeves
Affiliation:
Department of Psychology, Northeastern University, Boston
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Abstract

The relation between the amplitude of visual responses to a checkerboard stimulus and the degree of lateral displacement of the checks was examined across different check sizes with simultaneously recorded electroretinograms (ERGs) and visual-evoked potentials (VEPs). The amplitudes of both the b–wave and the after-potential of the ERG increase linearly with pattern displacement. However, the major components of the VEP (N70 and P100) were smaller than expected from linearity for both small checks with small displacements (thresholding) and for large checks with large displacements (saturation). These results suggest that the ERG is proportional to the number of receptors stimulated, but the VEP reflects neural processes influenced by the spatial structure of the stimulus.

Keywords

HumanVisual-evoked potentialElectroretinogramPattern displacementLinearityReceptive field
Type
Research Articles
Information
Visual Neuroscience , Volume 8 , Issue 2 , February 1992 , pp. 127 - 136
Copyright
Copyright © Cambridge University Press 1992

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