English: Apparatus and task. Top, layout of the work space. The animal was seated on a primate chair,

25 em away from the front lights. The center of the center cube was aligned with the body midline at shoulder height. The animal performed 3 sets of movement directions in the left, center and right parts of the work space. Black dots indicate the 3 movement origins within each part of space where monkeys made equal-amplitude (8.7 cm) movements of common origin in 8 different directions (arrows). Certain push-buttons are labeled by 2 numbers (2, 11; 12,21; etc.) because they were targets of movements of two different origins. Numbers identify directions of movement. Bottom, triplet (1-

11-21) of movements of similar direction performed across the work space. Down. Spatial orientation of the vectors representing the preferred direction (PD), in the left, center,and right parts of space of apremotor cortical cell. Note the change in the orientation of this cell's PD.