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The luminance difference threshold as a contrast threshold: Evidence for inhibitory interactions in spatial summation

Authors
Journal
Vision Research
0042-6989
Publisher
Elsevier
Volume
17
Issue
6
Identifiers
DOI: 10.1016/s0042-6989(77)80003-5

Abstract

Abstract Spatial summation is examined with test stimuli that differ in their time course. Results indicate that ramp (gradual onset and offset) test flashes yield qualitatively different spatial summation functions than functions obtained with square-wave (rapid onset and offset) test flashes. The differences that are observed would not be anticipated if threshold for homogeneous disk stimuli derived from the convolution of purely excitatory retinal elements. Instead, these differences suggest the involvement of both excitatory and inhibitory factors in detection.

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