Control of Visually Guided Eye Movements
Mechanisms of Visually Guided Saccadic Eye Movements
cortical areas are involved in the generation of saccadic eye movements.
Figure 6 shows the monkey brain
and the major regions from which electrical stimulation elicits saccadic
eye movements. The insets show the saccades elicited with the dots representing
the direction of the gaze prior to stimulation. At most sites the saccades
produced have a fixed vector. What that vector is depends on where one
stimulates within the structure just as in the superior colliculus. The
visual field representation and the saccadic vectors produced are laid
out in a neat topographic order within each structure. Exceptions to vector
representation are seen in a frontal region called the medial eye fields
(MEF) and in parts of parietal cortex. In these areas the final positions
of the eye in orbit is coded, hence called a place code. There is an orderly
representation of these positions within these structures.