Table 2. Modulation onset of SS activity of PCs for the three animals: Onset of all modulations of all PCs.

Monkey	Cell group	Mean	SD	n	Range
M	Mod all	−32.9	67.8	560	−150 to 190
	Mod inc	−19.3	79.3	252	−150 to 190
	Mod dec	−44.0	54.3	308	−150 to 190
S	Mod all	−40.9	48.3	349	−150 to 190
	Mod inc	−35.5	39.0	137	−150 to 130
	Mod dec	−44.3	51.4	212	−150 to 190
W	Mod all	−29.9	44.8	172	−130 to 110
	Mod inc	−23.3	48.0	69	−110 to 90
	Mod dec	−34.3	42.3	103	−130 to 110

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).