Visual latency and brightness: an interpretation based on the responses of rods and ganglion cells in the frog retina.

Abstract:

:Rod and cone photoresponses in a variety of species have been accurately described with linear multistage filter models. In this study, the response latency and initial coding of intensity at two higher levels of visual processing are related to such photoreceptor responses. One level is the retinal output (spiking discharges from frog ganglion cells, based on experimental data reported here), the other is the perceptual level in humans (psychophysical latency and brightness functions, based on data from the literature). Photoreceptor responses are described with the "independent activation" model of Baylor et al. (1974). The intensity dependence of the early ganglion cell discharge, its latency and initial impulse frequency, is shown to follow from such a waveform, assuming that 1) latency L = l + D, where l is the time it takes for the rod response linearly summed over the ganglion cell's receptive field to reach a criterion amplitude, and D is a constant delay; and 2) the initial frequency (below saturation) is proportional to the steepness of rise of the summed rod response at time l. It is shown that the intensity dependences of 1) human visual latency and 2) brightness sensation, including effects of stimulus area and duration, are accounted for by the same model. The predicted functions are not power functions of intensity, but approximate such over wide ranges. Thus, a large body of psychophysical data is explained simply by the waveform of photoreceptor responses.

journal_name

Vis Neurosci

journal_title

Visual neuroscience

authors

Donner K

doi

10.1017/s0952523800012499

subject

Has Abstract

pub_date

1989-07-01 00:00:00

pages

39-51

issue

1

eissn

0952-5238

issn

1469-8714

pii

S0952523800012499

journal_volume

3

pub_type

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