Journal article
Vergence Fusion Sustaining Oscillations
Journal of eye movement research, v 14(1), pp 1-9
28 Jun 2021
PMID: 34221249
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Introduction: Previous studies have shown that the slow, or fusion sustaining, component of disparity vergence contains oscillatory behavior as would be expected if fusion is sustained by visual feedback. This study extends the examination of this behavior to a wider range of frequencies and a larger number of subjects. Methods: Disparity vergence responses to symmetrical 4.0 deg step changes in target position were recorded in 20 subjects. Approximately three seconds of the late component of each response were isolated using interactive graphics and the frequency spectrum calculated. Peaks in these spectra associated with oscillatory behavior were identified and examined. Results: All subjects exhibited oscillatory behavior with fundamental frequencies ranging between 0.37 and 0.55 Hz; much lower than those identified in the earlier study. All responses showed significant higher frequency components. The relationship between higher frequency components and the fundamental frequency suggest may be harmonics. A correlation was found across subjects between the amplitude of the fundamental frequency and the maximum velocity of the fusion initiating component probably due to the gain of shared neural pathways. Conclusion: Low frequency oscillatory behavior was found in all subjects adding support that the slow, or fusion sustaining, component is mediated by a feedback control.
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Details
- Title
- Vergence Fusion Sustaining Oscillations
- Creators
- John Semmlow - University of New BrunswickChang Yaramothu - New Jersey Institute of TechnologyMitchell Scheiman - Salus UniversityTara L. Alvarez - New Jersey Institute of Technology
- Publication Details
- Journal of eye movement research, v 14(1), pp 1-9
- Publisher
- Int Group Eye Movement Research
- Number of pages
- 9
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Pennsylvania College of Optometry (PCO)
- Web of Science ID
- WOS:000731421300001
- Scopus ID
- 2-s2.0-85110648108
- Other Identifier
- 991021900196404721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Ophthalmology