Fig. 8.

The relationship between color-sensitivity index (CSI) and TR. CSIs were calculated on the basis of mean firing rates in response to suprathreshold sinusoidal gratings. CSIs were considered infinite (Inf) for neurons that were unresponsive to the L+M stimulus. TRs were calculated from responses in the 2AFC detection task. The smaller of the 2 TRs from each neuron is shown here, but results were qualitatively similar when we used the larger one (see Fig. 6C).