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fMRI of color signals in human visual cortex

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The way we perceive an object’s color is determined both by its surroundings and by our attentional state. In this talk I will describe a series of neuroimaging experiments that we have performed to examine the way that color and contrast signals are represented in early human visual cortex. We show that V1 neurons are modulated by chromatic and achromatic contrast well beyond their classical receptive fields and that they appear to be grouped into macroscopic domains that show specialization for either color discrimination or spatial feature discrimination but not both.”

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