Figure 3.

Differences in surround suppression across stimulus conditions for contrast and coherence. A, Change in suppression index for contrast size tuning curves relative to the high contrast curve. Since the high condition suppression index is not shifted relative to itself, the curves of all neurons end at zero, by definition. Each gray line represents a separate neuron; the red line is the population mean. The asterisks indicate values significantly different from zero (p < 0.007, one-sided t test adjusted for multiple comparisons). Error bars represent SEs. B, Change in suppression index for coherence size tuning curves relative to the high coherence curve. C, Histogram of the suppression index difference between the lowest and the highest condition (coherence or contrast). The left-facing bars represent contrast measurements. The right-facing bars represent coherence measurements. Blue indicates significantly less suppression in the low condition. Red indicates significantly more suppression in the low condition. Black indicates no significance difference.