• Superior colliculus drives the reticular formation to make contralateral saccades. • The frontal eye fields and the parietal cortex drive the colliculus. • The parietal cortex provides an attentional signal and the frontal eye fields a motor signal. • The substantia nigra inhibits the colliculus unless • It is inhibited by the caudate nucleus • Which is, in turn, excited by the frontal eye field.