Figure 7.

Surround influence on ambiguous disparity classical receptive field input of zero-tuned neurons. (A) Example zero-tuned neuron where the square annulus does not appear to provide any classical receptive field input. On the left, the center tuning curve is plotted and the response to bistable disparity with varying disparity in the surround is plotted on the right. (B) Same data for a zero-tuned example neuron where the square annulus does appear to provide some classical receptive field input. Error bars are standard error with respect to trials. Population averages of classical receptive field and surround disparity tuning for a square annulus with a (C) 2.0-degree inner border dimension and (D) 1.5-degree inner border dimension. Error bars are standard error over neurons (normalized before averaging). (E) Surround modulation index histograms for a square annulus with a (E) 2.0-degree inner border dimension and (F) 1.5-degree inner border dimension. Both (C) and (E) show that there was no significant disparity selectivity in the response of the 2.0-degree surround across the population of neurons studied.