Fig. 3.

Instantaneous firing rate of a dSC visuomotor neuron after target onset and during single trials. A and B: visual and saccade-related activity following the appearance of a static target at different locations (Cartesian coordinates) of the right visual field. C–E: firing rate of the same neuron after the target appears and moves upward at the same horizontal eccentricity. In A and C, the target appears at a location corresponding to the preferred amplitude of the neuron’s movement field (MF). In D, the saccade is aimed at the same location as in A: the visual response is absent because the moving target appears outside the neuron’s response field. In E, the saccade is aimed at the same location as in B: the neuron does not fire when the target moves. Schema at bottom left shows the boundary of a putative MF (dashed line) and 3 saccade vectors. Crosses labeled A and B schematically represent starting position of saccades illustrated in A and B, respectively. Labels C, D, and E illustrate the saccade vectors shown in C–E.