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Group-averaged contrast gain functions in thin- versus thick-type columns (red and green, respectively) in area V2 (top left), V3 (top right), and V4 (bottom right). In all three areas, thick-type responses show a higher y intercept, and a shallower slope compared with thin-type responses. Because V3A showed few or no color-selective columns, responses in V3A (bottom left) are shown for disparity-selective sites only.
