Figure 5.

Directional tuning of feature detectors in natural movies. Experimental design was similar to that adopted with static pictures (Fig. 1) except probes consisted of moving gratings (arrows in A and B) embedded within movie segments in either congruent (moving along with the segment) or incongruent (moving in the direction opposite to it) configuration (B and A, respectively). Observers were asked to select the incongruent stimulus. Directional noise (C and D) was added to the probes. Directional tuning functions were derived for movie segments in their native, inverted (E), and reversed (G) configurations (black, red, and blue traces, respectively, in F). Error bars indicate ± 1 SEM.