Table 2.

Summary of direction/load interactions

	CS	CP	CP low-f	NA low-f
Cells tested	31	104	24	64
Directional	12 (39%)	30 (29%)	11 (46%)	15 (23%)
Muscle-like	6 (19%)	40 (38%)	10 (42%)	29 (45%)
Other	13 (42%)	34 (33%)	3 (13%)	20 (31%)

The number (and percentage) of neurons in which movement direction and torque loads influenced perimovement activity according to one of the following patterns: Directional, significant direction effect with no load effects; Muscle-like, significant direction-by-load interaction in which loads opposing a cell's preferred direction of movement were correlated with elevated perimovement activity; Other, any significant load effect or direction-by-load interaction that did not fit the muscle-like pattern. Neuronal categories (CS, CP, CP low-f, and NA low-f) are explained in caption for Table 1.