Zlatkova M, Vassilev A, 1999, "Temporal integration of blue-on-yellow luminance increments and decrements in human vision" Perception 28 ECVP Abstract Supplement
Temporal integration of blue-on-yellow luminance increments and decrements in human vision
M Zlatkova, A Vassilev
S-cones and their associated pathways have longer integration time than other cone systems. We studied temporal integration for blue-light increments and decrements to investigate how the S-cone system summates over time signals of opposite sign generated by the same receptor pool. S-cone isolation was achieved by presenting stimuli against a background consisting of 3 cd m-2 blue light and 300 cd m-2 yellow light. The stimuli were luminance increments and decrements of the blue light over a circular area, 4 deg in diameter. They were presented at 12.5 deg eccentricity. At brief durations the decrement thresholds were similar to the increment thresholds, but were lower at durations longer than 100 ms. The time of complete integration was longer for decrements than for increments, contrary to the expectations from time-integrative properties of the chromatic opponent system. Controls with red-on-red stimuli showed shorter integration time, independent of the stimulus sign. The extended temporal integration for decrements cannot be a property of the S-cones, but possibly reflects differences in post-receptoral ON and OFF mechanisms receiving S-cone input.
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