Temporal dynamics of saccades explained by a self-paced process

Abstract Sensory organs are thought to sample the environment rhythmically thereby providing periodic perceptual input. Whisking and sniffing are governed by oscillators which impose rhythms on the motor-control of sensory acquisition and consequently on sensory input. Saccadic eye movements are the...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Roy Amit, Dekel Abeles, Izhar Bar-Gad, Shlomit Yuval-Greenberg
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9dd6e5d768b7472fb70ab055b36a6c6c
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:9dd6e5d768b7472fb70ab055b36a6c6c
record_format	dspace
spelling	oai:doaj.org-article:9dd6e5d768b7472fb70ab055b36a6c6c2021-12-02T12:32:19ZTemporal dynamics of saccades explained by a self-paced process10.1038/s41598-017-00881-72045-2322https://doaj.org/article/9dd6e5d768b7472fb70ab055b36a6c6c2017-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-00881-7https://doaj.org/toc/2045-2322Abstract Sensory organs are thought to sample the environment rhythmically thereby providing periodic perceptual input. Whisking and sniffing are governed by oscillators which impose rhythms on the motor-control of sensory acquisition and consequently on sensory input. Saccadic eye movements are the main visual sampling mechanism in primates, and were suggested to constitute part of such a rhythmic exploration system. In this study we characterized saccadic rhythmicity, and examined whether it is consistent with autonomous oscillatory generator or with self-paced generation. Eye movements were tracked while observers were either free-viewing a movie or fixating a static stimulus. We inspected the temporal dynamics of exploratory and fixational saccades and quantified their first-order and high-order dependencies. Data were analyzed using methods derived from spike-train analysis, and tested against mathematical models and simulations. The findings show that saccade timings are explained by first-order dependencies, specifically by their refractory period. Saccade-timings are inconsistent with an autonomous pace-maker but are consistent with a “self-paced” generator, where each saccade is a link in a chain of neural processes that depend on the outcome of the saccade itself. We propose a mathematical model parsimoniously capturing various facets of saccade-timings, and suggest a possible neural mechanism producing the observed dynamics.Roy AmitDekel AbelesIzhar Bar-GadShlomit Yuval-GreenbergNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-15 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Roy Amit Dekel Abeles Izhar Bar-Gad Shlomit Yuval-Greenberg Temporal dynamics of saccades explained by a self-paced process
description	Abstract Sensory organs are thought to sample the environment rhythmically thereby providing periodic perceptual input. Whisking and sniffing are governed by oscillators which impose rhythms on the motor-control of sensory acquisition and consequently on sensory input. Saccadic eye movements are the main visual sampling mechanism in primates, and were suggested to constitute part of such a rhythmic exploration system. In this study we characterized saccadic rhythmicity, and examined whether it is consistent with autonomous oscillatory generator or with self-paced generation. Eye movements were tracked while observers were either free-viewing a movie or fixating a static stimulus. We inspected the temporal dynamics of exploratory and fixational saccades and quantified their first-order and high-order dependencies. Data were analyzed using methods derived from spike-train analysis, and tested against mathematical models and simulations. The findings show that saccade timings are explained by first-order dependencies, specifically by their refractory period. Saccade-timings are inconsistent with an autonomous pace-maker but are consistent with a “self-paced” generator, where each saccade is a link in a chain of neural processes that depend on the outcome of the saccade itself. We propose a mathematical model parsimoniously capturing various facets of saccade-timings, and suggest a possible neural mechanism producing the observed dynamics.
format	article
author	Roy Amit Dekel Abeles Izhar Bar-Gad Shlomit Yuval-Greenberg
author_facet	Roy Amit Dekel Abeles Izhar Bar-Gad Shlomit Yuval-Greenberg
author_sort	Roy Amit
title	Temporal dynamics of saccades explained by a self-paced process
title_short	Temporal dynamics of saccades explained by a self-paced process
title_full	Temporal dynamics of saccades explained by a self-paced process
title_fullStr	Temporal dynamics of saccades explained by a self-paced process
title_full_unstemmed	Temporal dynamics of saccades explained by a self-paced process
title_sort	temporal dynamics of saccades explained by a self-paced process
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/9dd6e5d768b7472fb70ab055b36a6c6c
work_keys_str_mv	AT royamit temporaldynamicsofsaccadesexplainedbyaselfpacedprocess AT dekelabeles temporaldynamicsofsaccadesexplainedbyaselfpacedprocess AT izharbargad temporaldynamicsofsaccadesexplainedbyaselfpacedprocess AT shlomityuvalgreenberg temporaldynamicsofsaccadesexplainedbyaselfpacedprocess
_version_	1718394109737041920

Temporal dynamics of saccades explained by a self-paced process

Ejemplares similares