Authors
Vernet, Marine MS; Yang, Qing MD, PhD; Daunys, Gintautas PhD; Orssaud, Christophe MD; Kapoula, Zoï PhD

Divergence Influences Triggering of Both Vertical and Horizontal Saccades

publication date
November 8, 2007
Category
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Abstract/Introduction

Purpose

In real life, divergence is frequently combined with vertical saccades. The purpose of this study was to examine the initiation of vertical and horizontal saccades, pure or combined with divergence.

 

Methods

We used a gap paradigm to elicit vertical or horizontal saccades (10 degrees), pure or combined with a predictable divergence (10 degrees). Eye movements from 12 subjects were recorded with EyeLink II.


Conclusion/Results

Results

The major results were (i) when combined with divergence, the latency of horizontal saccades increased but not the latency of vertical saccades; (ii) for both vertical and horizontal saccades, a tight correlation between the latency of saccade and divergence was found; (iii) when the divergence was anticipated, the saccade was delayed.

 

Conclusion

We conclude that the initiation of both components of combined movements is interdependent.


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