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
Full Article | PDF ArticleMore Like This
Marcel J. Sankeralli and Kathy T. Mullen
J. Opt. Soc. Am. A 13(5) 906-915 (1996)
Harald J. Teufel and Christian Wehrhahn
J. Opt. Soc. Am. A 17(6) 994-1006 (2000)
Marcel J. Sankeralli and Kathy T. Mullen
J. Opt. Soc. Am. A 14(10) 2633-2646 (1997)