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Color vision is begins when light energy is transduced by three classes of cone photoreptors. The fact that there are three classes of cones leads to the trichromacy of human vision. But what happens next? Signals from each cone are transformed by subsequent neural processing. Eventually, somewhere in the cortex, these transformations presumably produce signals that correspond to our subjective experience. I am interested in understanding what neural transformations are applied to cone signals and in connecting this understanding to our measurements of color constancy. Most of my work in this area employs a psychophysical approach, where behavioral data is used to make educated guesses about what is going on in the neural substrate. We have also record ERGs in response to colored stimuli and are beginning to make measurements of the responses of single units in retina.
David Brainard: 16 July, 2006