Abstract

Detection thresholds were obtained for a 2° Gaussian-blurred spot flashed for 200 ms on an 8.9° white adapting field of 1070 trolands. The spot’s contrast was represented in an L-, M-, and S-cone contrast space. Detection thresholds were obtained for many vectors close to specific but theoretically important planes within this space. A three-dimensional surface was fitted to the data generated by the probability summation of three mechanisms, each a weighted sum of cone contrasts. The fit revealed a red–green chromatic mechanism driven by ΔL/L − ΔM/M with no S-cone input that was 1 order of magnitude more sensitive than the two other mechanisms. The latter consisted of a luminance mechanism with little S-cone input and a blue–yellow chromatic mechanism with the S cone opposed to L and M cones.

© 1993 Optical Society of America

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