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Balanced interactions in ganglion-cell receptive fields

Published online by Cambridge University Press:  01 March 1999

A.M. GRANDA ,
J.R. DEARWORTH  and
B. SUBRAMANIAM
A.M. GRANDA
Affiliation:
Department of Biological Sciences, University of Delaware, Newark
J.R. DEARWORTH
Affiliation:
Department of Biological Sciences, University of Delaware, Newark
B. SUBRAMANIAM
Affiliation:
Department of Biological Sciences, University of Delaware, Newark
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Abstract

Receptive fields of retinal ganglion cells in turtle have excitatory and inhibitory components that are balanced along the dimensions of wavelength, functional ON and OFF responses, and spatial assignments of center and surround. These components were analyzed by spectral light adaptations and by the glutamate agonist, 2-amino-4-phosphonobutyric acid (APB). Extracellular recordings to stationary and moving spots of light were used to map changes in receptive fields. ON spike counts minus OFF spike counts, derived from flashed stationary light spots, quantified functional shifts by calculating normalized mean response modulations. The data show that receptive fields are not static, but rather are dynamic arrangements which depend on linked, antagonistic balances among the three dimensions of wavelength, ON and OFF response functions, and center/surround areas.

Keywords

Retinal ganglion cellReceptive-field formationSpectral light adaptation2-Amino-4-phosphonobutyric acidTurtle
Type
Research Article
Information
Visual Neuroscience , Volume 16 , Issue 2 , March 1999 , pp. 319 - 332
Copyright
1999 Cambridge University Press

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