Chapter

Control of Eye Movements

Nigel Daw

in How Vision Works

Published in print January 2012 | ISBN: 9780199751617
Published online May 2012 | e-ISBN: 9780199932375 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780199751617.003.0008
Control of Eye Movements

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There are eye movements to place objects of interest onto the fovea (saccades and vergence), and to keep it there (smooth pursuit, fixation, optokinetic, and vestibular). Signals converge onto the parietal cortex to determine what is of interest, and onto the frontal eye fields and superior colliculus to determine the size and direction of the movement to be made. Both sensory and motor signals are represented in all these areas, and saccades, smooth pursuit, and vergence signals are found in all of them. The basal ganglia act to release the system from fixation, and the cerebellum controls adaptation of the size of saccades. Different locations at these higher areas give the size and direction of the movement. This is translated into horizontal and vertical components in the brainstem, and strength of signal to give the size of the movement.

Keywords: saccades; smooth pursuit; vergence; fixation; optokinetic; vestibular; frontal eye fields; superior colliculus; basal ganglia; cerebellum

Chapter.  13465 words.  Illustrated.

Subjects: Neuropsychology

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