Activity of a typical SOA near-response cell in animal S1 during monocular fixation with either the right eye or the left eye. Top panel shows eye positions (right eye, red; left eye, blue) and the bottom panel shows neural activity (gray, raw action potentials; blue, unit spike density function). Upward and rightward eye positions are positive. The eye positions in the top panel show that the non-fixating eye is abducted (exotropia). The panels show that when the animal views with his right eye, the angle of exotropia is less, and the neural firing rate of the SOA cell is high. When the animal switches fixation to the left eye, the angle of exotropia increases (divergent movement) and there is a reduction in firing rate.