Fig. 8.

An example of a 2-segment stimulation study that reveals neuronal response interactions between local motion stimuli presented at the set location or the test location. A, left: spike density histograms (SDHs) of responses to local motion at the fixed-direction location, indicating a preference for right-downward planar motion (open arrow). Right: SDHs of responses to local motion at the probe location, indicating a preference for left-downward planar motion. B: responses when local motion was presented simultaneously at both the fixed-direction and probe locations. Left: when leftward motion was presented at the fixed-direction location (green arrows), the direction preference for stimuli at the probe location (SDHs) yielded little net direction selectivity. Right: when rightward local motion was presented at the fixed-direction location (blue arrows), the direction preference for stimuli at the probe location (SDHs) yielded strong right-upward selectivity, a 180° change from the probe location's original directionality.