Divergence eye movements are dependent on initial stimulus position

Document Type

Article

Publication Date

1-1-2005

Abstract

Previous studies on the speed and latency of convergence and divergence eye movements have produced varied, sometimes contradictory, results. Four subjects were studied and tracked 4°disparity step changes for convergence and divergence at different initial target positions. Here we report that the dynamics of divergence movements not only differ from convergence movement, but depend on the initial vergence position. Velocities of divergence eye movements in response to targets that were initially near to the subject were approximately twice that of responses to initially distant targets and also exhibited shorter temporal properties. Hence, while convergence responses are fairly similar irrespective of the initial position, divergence dynamic and temporal properties are dependent on the initial stimulus position. It is speculated that the differences observed in divergence may be the result of nonlinear properties of the extraocular muscles or a difference in the underlying neural controller potentially a difference in the magnitude of the fusion initiating component of divergence. © 2005 Elsevier Ltd. All rights reserved.

Identifier

15944409583 (Scopus)

Publication Title

Vision Research

External Full Text Location

https://doi.org/10.1016/j.visres.2005.01.017

ISSN

00426989

PubMed ID

15797774

First Page

1847

Last Page

1855

Issue

14

Volume

45

This document is currently not available here.

Share

COinS