The effect of expectations on slow oculomotor control—II. Single target displacements

doi:10.1016/0042-6989(79)90239-6

Vision Research

Volume 19, Issue 6, 1979, Pages 633-646

https://doi.org/10.1016/0042-6989(79)90239-6 Get rights and content

Abstract

It had previously been reported that when periodic target steps are tracked, the eye moves smoothly in the expected direction of the target step before the step occurs. Here we report anticipatory smooth eye movements with single target steps, with single ramps, and during smooth pursuit when a single target step is expected following a ramp. The direction and latency of anticipatory smooth eye movements depended on the expected direction and time of the step, but steps in unpredictable directions or at unpredictable times also influenced smooth eye movements. Anticipatory smooth eye movements require retinal error signals. They were not found in the absence of visual targets.

Our demonstration that expected target motion need not be predictable nor periodic in order for anticipatory smooth eye movements to occur suggests that expectations about the future position of targets always influence slow eye movements.

Reference (16)

KowlerE. et al.
The effect of expectations on slow oculomotor control—I. Periodic target steps
Vision Res.
(1979)
MurphyB.J. et al.
Slow oculomotor control in the presence of moving backgrounds
Vision Res.
(1975)
SkavenskiA.A. et al.
Control of eye position in the dark
Vision Res.
(1970)
SteinmanR.M. et al.
Voluntary control of smooth pursuit velocity
Vision Res.
(1969)
AschoffJ.C.
Reconsideration of the oculomotor pathway
BowerT.G.R.
Development in Infancy
(1974)
DallosP.J. et al.
Learning behavior of the eye fixation control system
I.R.E. Trans. autom. Control
(1963)
HaddadG.M. et al.
The smallest voluntary saccade: Implications for fixation
Vision Res.
(1973)

There are more references available in the full text version of this article.

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¹: Present address: Department of Psychology, 6 Washington Place, Room 961, New York University. New York. NY 10003. U.S.A.

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The effect of expectations on slow oculomotor control—II. Single target displacements

Abstract

Vision Res.

Vision Res.

Vision Res.

Vision Res.

Reconsideration of the oculomotor pathway

Development in Infancy

Learning behavior of the eye fixation control system

I.R.E. Trans. autom. Control

The smallest voluntary saccade: Implications for fixation

Vision Res.