Direction differential maps and response profile analyses from a posterior part of area 17.

<p>(A) Image of the cortical vasculature. The white broken line delimits the border between area 17 and 18. The green polygon indicates the posterior part of area 17 selected for analysis. A, Anterior; L, lateral. Scale bar: 1 mm. (B–C) Differential direction maps (0°–180°, B; 90°–270°, C) and the corresponding results of response profile analysis obtained by moving random-dot stimuli with different speeds. Colored iso-direction contours were derived from the direction preference map for sine-wave gratings and were superimposed on the gray images. The red curves in the plots represent the best fitting cosine functions. The values of the ordinates correspond to the recorded responses () × 10⁴.