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Computer simulation of overshoot in saccadic eye movements

✍ Scribed by A.Terry Bahill; Michael R. Clark; Lawrence Stark

Publisher
Elsevier Science
Year
1975
Weight
448 KB
Volume
4
Category
Article
ISSN
0010-468X

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✦ Synopsis

The human horizontal eye movement system produces quick, precise, conjugate eye movements called saccades. These are important in normal vision. For example, reading tasks exclusively utilize saccadic eye movements. The majority of saccades have dynamic overshoot. The amplitude of this overshoot is independent of saccadic amplitude, and is such that it places the image of the stimulus within the retinal region of maximum acuity within a minimum of time.

A computer based model of the saccadic mechanisms was used to study the origin of this overshoot. It was discovered that dynamic overshoot cannot be attributed to biomechanical properties of the eye movement mechanism, but must instead be explained by variations in the controlling nervous activity. The form of this neural controller signal is very similar to that required for a time optimal response of an inertial system.

Saccade

Overshoot Neurological control Glissade Damping Oculomotor neurons Main sequence Eye movements Time optimal control

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