Modulation onset of SS activity of PCs for the three animals: Onset of all modulations of all PCs.

Most PCs showed modulation for two to eight movement directions. Mod all: all modulations. Mod inc: increases in modulation. Mod dec: decreases in modulation. n: numbers of modulations in individual categories. See also Fig. 6C and D. There was significant difference between Mod inc and Mod dec in monkey M and S (p<0.0003 and 0.002, respectively, Mann-Whitney U-test), but not in monkey W (p<0.13, Mann-Whitney U-test). Modulation onset of SS activity of PCs for the three animals: Onset of all modulations of all PCs.