Visual detection following retinal damage: predictions of an inhomogeneous retino-cortical model

Thomas L. Arnow; Wilson S. Geisler

doi:10.1117/12.237500

1 April 1996 Visual detection following retinal damage: predictions of an inhomogeneous retino-cortical model

Thomas L. Arnow, Wilson S. Geisler

Proceedings Volume 2674, Laser-Inflicted Eye Injuries: Epidemiology, Prevention, and Treatment; (1996) https://doi.org/10.1117/12.237500
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

A model of human visual detection performance has been developed, based on available anatomical and physiological data for the primate visual system. The inhomogeneous retino- cortical (IRC) model computes detection thresholds by comparing simulated neural responses to target patterns with responses to a uniform background of the same luminance. The model incorporates human ganglion cell sampling distributions; macaque monkey ganglion cell receptive field properties; macaque cortical cell contrast nonlinearities; and a optical decision rule based on ideal observer theory. Spatial receptive field properties of cortical neurons were not included. Two parameters were allowed to vary while minimizing the squared error between predicted and observed thresholds. One parameter was decision efficiency, the other was the relative strength of the ganglion-cell center and surround. The latter was only allowed to vary within a small range consistent with known physiology. Contrast sensitivity was measured for sinewave gratings as a function of spatial frequency, target size and eccentricity. Contrast sensitivity was also measured for an airplane target as a function of target size, with and without artificial scotomas. The results of these experiments, as well as contrast sensitivity data from the literature were compared to predictions of the IRC model. Predictions were reasonably good for grating and airplane targets.

Citation Download Citation

Thomas L. Arnow and Wilson S. Geisler "Visual detection following retinal damage: predictions of an inhomogeneous retino-cortical model", Proc. SPIE 2674, Laser-Inflicted Eye Injuries: Epidemiology, Prevention, and Treatment, (1 April 1996); https://doi.org/10.1117/12.237500

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