We used the chromatic visual evoked potential, the cVEP, to study responses in human visual cortex evoked by equiluminant color stimuli for six male and 11 female observers. Large-area, colored squares were used to stimulate Single-Opponent cells preferentially, and fine color-checkerboard stimuli were used to activate Double-Opponent responses preferentially. Stimuli were modulated along two directions in color space: 1) the cardinal direction, L-M or M-L of DKL space; 2) the line from the white point to the color of the Red LED in the display screen, which was roughly intermediate between the L-M and -S directions in DKL space in cone-contrast coordinates. The amplitudes of cVEPs to large squares were smaller than those to checkerboards, and latency of the cVEP response to squares was significantly less than the checkerboard latency. The latency of cVEP responses to the squares varied little with cone-contrast unlike the steep reduction of latency with cone-contrast observed in responses to color checker...