Divergence dynamic modification as a function of initial position

Tara L. Alvarez, Bassem Gayed

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

The ability to change or adapt is critical in the survival of a species. Research has shown that the dynamics of disparity vergence eye movements, the inward (convergence) or outward (divergence) turning of the eyes, are malleable and depend to some extent on the amplitude of preceding stimuli. Divergence eye movements are dependent on initial stimulus position where responses that occur closer to the subject are faster compared to responses that occur farther from the subject. The purpose of this study was to investigate if the modification of divergence eye movements was also a function of initial stimulus position. An experimental trial consisted of three phases: baseline, modification, and recovery. The baseline and recovery phases used only 4° test stimuli. The modification phase consisted of a 4° test randomly intermixed with an 8° step presented in a 1:5 ratio. Two experiments were conducted, one with an initial vergence angle of 8° (far) and the other with an initial position of 20° or 18° (near). Two subjects participated. The dynamic characteristics of the responses to test stimuli were quantified by measuring the magnitude of the peak velocity. Preliminary results suggest the amount of change in peak velocity was greater when the stimuli were closer to the subject. Data suggest that the peak velocity of divergence observed during baseline conditions maybe correlated to the ability to change the dynamics of the disparity vergence system.

Original languageEnglish (US)
Title of host publication28th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'06
Pages5683-5686
Number of pages4
DOIs
StatePublished - Dec 1 2006
Event28th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'06 - New York, NY, United States
Duration: Aug 30 2006Sep 3 2006

Publication series

NameAnnual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
ISSN (Print)0589-1019

Other

Other28th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'06
Country/TerritoryUnited States
CityNew York, NY
Period8/30/069/3/06

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Biomedical Engineering
  • Computer Vision and Pattern Recognition
  • Health Informatics

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