Figure 3. Effects of cortical inactivation on ON and OFF reponses.

Direction selective responses to a light edge (left panels) or a dark edge (right panels) moving at velocities from 5–40°/s in preferred (filled circles, solid black line) and non preferred (open circles and broken line) directions. Mean and standard deviation from 5 units are plotted, control measurements in A, measurements during cooling in B, and after rewarming in C. ordinate: neuronal activity in spikes/second; abscissa: stimulus velocity in degrees/second. There was no significant alteration of response strength and direction selectivity by cortical cooling at any of the velocities tested.