Fig. 4.

Clustering according to direction of motion in adult cat area 18. The results presented here were obtained from an adult cat. A–F illustrate the results in a format identical to that of Figure 3. The presented maps were obtained from vertical gratings moving left and right. The whole range of gray levels represents a fractional change of 2 × 10⁻³ inA, B, D, 0.9 × 10⁻³ in C, and 1 × 10⁻³ in E and F(wavelength 630 ± 10 nm). The ratio of the amplitudes here was 3.5, and the average S/N of the direction maps was 4.8 ± 0.9. Scale bar, 1 mm.