Figure 11.

Impact of stimulus size on temporal frequency tuning. A, B, Response amplitude (A) and phase (B) of one MC cell for drifting gratings presented in windows of 1° (open symbols) and 8° (filled symbols) at each of two contrast levels (dashed lines, 0.1; solid lines, 0.75). Window diameter has no effect on response amplitude or phase at 0.1 contrast; at 0.75 contrast, enlarging the window reduced responses for all temporal frequencies tested, but had little effect on response phase. The inset in B shows the response phase at 4.3 Hz as a function of contrast for the two window sizes. Contrast has more impact than window size. C, Average reduction in response (SIs) for 10 MC cells at each of the three contrast levels tested. Suppression is greatest at midfrequencies. Error bars are 1 SEM.