Figure 4.

MT size tuning during V2/V3 inactivation. A, Size tuning curves computed from the responses of four different MT neurons. Each neuron is represented by a pair of tuning curves showing its control (black) and cooling (gray) responses. Cells differed in the functional responses of the modulatory surround: some being facilitatory (top row) while others exhibited suppressive properties (bottom row). Vertical lines show the mean and SEM. Curves are either error function or difference of error function fits. B, Preferred size measured before and during cooling (±SEM) (via bootstrap, 500 iterations). Open symbols, multiunits, closed symbols single units. C, Distribution of surround suppression values before and during cooling.