Before revision:  This finding was confirmed and modeled with a third experiment, in which subjects were asked to match the color of two stimuli surrounded by two different chromaticities  .
After revision:  This finding was confirmed and modeled with a third experiment, in which subjects were asked to match the color of two stimuli surrounded by two different chromaticities . Again, in the perceptual coordinates the induction effect produced by surrounds followed a simple, symmetric law. We conclude that the individually-tailored notion of perceptual distance reveals the symmetry of the laws governing perceptual computations .