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A comparison of the components of the multifocal and full-field ERGs

Published online by Cambridge University Press:  02 June 2009

Donald C. Hood ,
William Seiple ,
Karen Holopigian  and
Vivienne Greenstein
Donald C. Hood
Affiliation:
Department of Psychology, Columbia University, New York
William Seiple
Affiliation:
Department of Ophthalmology, NYU Medical Center, New York
Karen Holopigian
Affiliation:
Department of Ophthalmology, NYU Medical Center, New York
Vivienne Greenstein
Affiliation:
Department of Ophthalmology, NYU Medical Center, New York
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Abstract

The multi-input technique of Sutter and Tran (1992) yields multiple focal ERGs. The purpose here was to compare the components of this multifocal ERG to the components of the standard, full-field ERG. To record multifocal ERGs, an array of 103 hexagons was displayed on a monitor. Full-field (Ganzfeld) ERGs were elicited by flashes presented upon steady background fields. The latencies of two prominent subcomponents of the full-field ERG were altered by varying the intensity of the incremental flash or the intensity of the background field. By showing that similar manipulations of the multi-input parameters produce similar changes in latency, we were able to relate the components of the multifocal ERG to the components of the full-field ERG. The biphasic responses of the multifocal ERG appear to be generated by the same cells generating the a-wave and positive peaks of the full-field cone ERG.

Keywords

ERGMultifocalMulti-inputHuman
Type
Research Articles
Information
Visual Neuroscience , Volume 14 , Issue 3 , May 1997 , pp. 533 - 544
Copyright
Copyright © Cambridge University Press 1997

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