Dynamic assessment of disparity vergence ramps

Document Type

Article

Publication Date

7-1-2007

Abstract

Previous work has shown that the disparity vergence eye movement system responds to inward (i.e., convergent) ramp stimuli with both smooth and step-like behavior depending on target velocity. The responses to diverging ramp stimuli have not been previously studied, but convergence and divergence responses to other stimuli often show different behaviors. Converging and diverging 6°/s ramps were presented to four subjects over a stimulus range of 2°-20°. Step-like behavior was seen in both convergence and divergence responses, but the dynamics was different. For divergent ramps, the peak velocity of each step-like movement decreased as the stimulus moved away from the subject, but no such trend was observed for convergence. The step-like behavior seen in divergence supports the hypothesis that the transient component is active in disparity divergence similar to the transient component proposed for convergent movements. However, the transient component in divergence may be dependent on stimulus position which is not the case for convergence. © 2006 Elsevier Ltd. All rights reserved.

Identifier

34247180240 (Scopus)

Publication Title

Computers in Biology and Medicine

External Full Text Location

https://doi.org/10.1016/j.compbiomed.2006.03.009

ISSN

00104825

PubMed ID

16737692

First Page

903

Last Page

909

Issue

7

Volume

37

Grant

BES-0447713

Fund Ref

National Science Foundation

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