The effect of lesions
Monkeys with collicular or frontal eye field
lesions make saccades with a slightly longer
reaction time.
Monkeys with combined lesions cannot make
saccades at all.
Humans with parietal lesions neglect visual
stimuli, but have no specific eye movement
deficits. If they can see it they can make
saccades to it.
Humans with frontal lesions cannot make
antisaccades.