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Evidence for local circuits within the receptive fields of retinal ganglion cells in goldfish

Published online by Cambridge University Press:  02 June 2009

Michael W. Levine  and
Roger P. Zimmerman
Michael W. Levine
Affiliation:
The University of Illinois at Chicago, Department of Psychology and the Committee on Neuroscience, Chicago
Roger P. Zimmerman
Affiliation:
Departments of Neurological Sciences and Physiology, Rush Medical College, Chicago
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Abstract

A new form of receptive field map, the response-component map, was developed to identify points within a receptive field that produce similar response patterns. The fields were probed with discretely flashed small spots of light. The magnitudes of the responses to stimulus onset and to stimulus offset elicited at each point were represented on the map by a vector radiating from the position representing the location of that point. Thus, response-component maps preserve the spatial distributions of responsivity and temporal nonlinearities. Points with similar response patterns were identified from a scatterplot in which the response at each spatial position was located in a plane representing the angles of the response-component vectors. Points with similar response characteristics that were also spatially contiguous were considered as a distinct response subregion within the receptive field.

Barely 10% of the receptive fields of goldfish ganglion cells mapped with this technique proved as simple as the traditional concentric field described for retinal cells. In at least 17% of the cases, the field showed three concentric rings, with a very small “inner center” within the center of the field. In at least 50% of the cases, response subregions of different type lay side by side, rather than in a concentric configuration. Some subregions could be differentiated by the relative strengths of the responses to onset and offset of the stimulus spot, supporting the hypothesis that a push-pull system generates ganglion cell responses. Subregions were evident in successive mappings of the same cell, demonstrating they are not due to the vagaries of individual responses. They probably represent the spatial domains (or their intersections) of individual interneurons distal to the retinal ganglion cells. It is possible that position within the receptive field may be coded by the temporal pattern of the responses.

Keywords

Retinal ganglion cellsGoldfish retinaReceptive fields
Type
Research Articles
Information
Visual Neuroscience , Volume 1 , Issue 4 , July 1988 , pp. 377 - 385
Copyright
Copyright © Cambridge University Press 1988

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