Divergence influences triggering of both vertical and horizontal saccades

Optom Vis Sci. 2008 Mar;85(3):187-95. doi: 10.1097/OPX.0b013e3181647196.

Abstract

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.

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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Convergence, Ocular / physiology*
  • Female
  • Humans
  • Male
  • Middle Aged
  • Saccades / physiology*
  • Vision, Binocular / physiology*