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Torsional component of microsaccades during fixation and quick phases during optokinetic stimulation

While many studies have characterized the eye movements during visual fixation, includ-ing microsaccades, in most cases only horizontal and vertical components have been rec-orded and analyzed. Thus, little is known about the torsional component of microsaccades. We took advantage of a newly develop...

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Autores principales: Sadeghpour, Shirin, Otero-Millan, Jorge
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Bern Open Publishing 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8010913/
https://www.ncbi.nlm.nih.gov/pubmed/33828810
http://dx.doi.org/10.16910/jemr.13.5.5
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author Sadeghpour, Shirin
Otero-Millan, Jorge
author_facet Sadeghpour, Shirin
Otero-Millan, Jorge
author_sort Sadeghpour, Shirin
collection PubMed
description While many studies have characterized the eye movements during visual fixation, includ-ing microsaccades, in most cases only horizontal and vertical components have been rec-orded and analyzed. Thus, little is known about the torsional component of microsaccades. We took advantage of a newly developed software and hardware to record eye movements around the three axes of rotation during fixation and torsional optokinetic stimulus. We found that the average amplitude of the torsional component of microsaccades during fixation was 0.34 ± 0.07 degrees with velocities following a main sequence with a slope comparable to the horizontal and vertical components. We also found the size of the tor-sional displacement during microsaccades was correlated with the horizontal but not the vertical component. In the presence of an optokinetic stimulus a nystagmus was induced producing a more frequent and larger torsional quick phases compared to microsaccades produced during fixation with a stationary stimulus. The torsional component and the vertical vergence component of quick phases grew larger with higher velocities. Addition-ally, our results validate and show the feasibility of recording torsional eye movements using video eye tracking in a desktop mounted setup.
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spelling pubmed-80109132021-04-06 Torsional component of microsaccades during fixation and quick phases during optokinetic stimulation Sadeghpour, Shirin Otero-Millan, Jorge J Eye Mov Res Research Article While many studies have characterized the eye movements during visual fixation, includ-ing microsaccades, in most cases only horizontal and vertical components have been rec-orded and analyzed. Thus, little is known about the torsional component of microsaccades. We took advantage of a newly developed software and hardware to record eye movements around the three axes of rotation during fixation and torsional optokinetic stimulus. We found that the average amplitude of the torsional component of microsaccades during fixation was 0.34 ± 0.07 degrees with velocities following a main sequence with a slope comparable to the horizontal and vertical components. We also found the size of the tor-sional displacement during microsaccades was correlated with the horizontal but not the vertical component. In the presence of an optokinetic stimulus a nystagmus was induced producing a more frequent and larger torsional quick phases compared to microsaccades produced during fixation with a stationary stimulus. The torsional component and the vertical vergence component of quick phases grew larger with higher velocities. Addition-ally, our results validate and show the feasibility of recording torsional eye movements using video eye tracking in a desktop mounted setup. Bern Open Publishing 2020-10-20 /pmc/articles/PMC8010913/ /pubmed/33828810 http://dx.doi.org/10.16910/jemr.13.5.5 Text en This work is licensed under a Creative Commons Attribution 4.0 International License, ( https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use and redistribution provided that the original author and source are credited.
spellingShingle Research Article
Sadeghpour, Shirin
Otero-Millan, Jorge
Torsional component of microsaccades during fixation and quick phases during optokinetic stimulation
title Torsional component of microsaccades during fixation and quick phases during optokinetic stimulation
title_full Torsional component of microsaccades during fixation and quick phases during optokinetic stimulation
title_fullStr Torsional component of microsaccades during fixation and quick phases during optokinetic stimulation
title_full_unstemmed Torsional component of microsaccades during fixation and quick phases during optokinetic stimulation
title_short Torsional component of microsaccades during fixation and quick phases during optokinetic stimulation
title_sort torsional component of microsaccades during fixation and quick phases during optokinetic stimulation
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8010913/
https://www.ncbi.nlm.nih.gov/pubmed/33828810
http://dx.doi.org/10.16910/jemr.13.5.5
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