English: The increased net membrane excitation traveling from areas 19/21 toward areas 17 and 18. (A) Animation of the stimuli in the occlusion condition with a frame frequency of 200 Hz. Distance from the center of field of view shown on the sides of the monitor. Time in ms from the start of motion is shown in green. (B) The statistically significant part of ΔV(t)rel (phase plot) (p < 0.01) averaged across animals in response to two bars moving to occlusion. The feedback began at 120 ms after stimulus onset and traveled toward the 17/18 border with an average velocity of 0.12 mm ms−1 where it arrived at 160 ms (standard error of mean 10 ms, n = 14). The signal then decreases as the bars approach one another. This decrease then surrounds the site mapping the occlusion (representing center of field of view), black circle.