Persistence in eye movement during visual search

As any cognitive task, visual search involves a number of underlying processes that cannot be directly observed and measured. In this way, the movement of the eyes certainly represents the most explicit and closest connection we can get to the inner mechanisms governing this cognitive activity. Here...

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Main Authors:	Amor, Tatiana A., Reis, Saulo D. S., Campos, Daniel, Herrmann, Hans J., Andrade, José S.
Format:	Online
Language:	English
Published:	Nature Publishing Group 2016
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4807769/

id	pubmed-4807769
recordtype	oai_dc
spelling	pubmed-48077692016-03-28 Persistence in eye movement during visual search Amor, Tatiana A. Reis, Saulo D. S. Campos, Daniel Herrmann, Hans J. Andrade, José S. Article As any cognitive task, visual search involves a number of underlying processes that cannot be directly observed and measured. In this way, the movement of the eyes certainly represents the most explicit and closest connection we can get to the inner mechanisms governing this cognitive activity. Here we show that the process of eye movement during visual search, consisting of sequences of fixations intercalated by saccades, exhibits distinctive persistent behaviors. Initially, by focusing on saccadic directions and intersaccadic angles, we disclose that the probability distributions of these measures show a clear preference of participants towards a reading-like mechanism (geometrical persistence), whose features and potential advantages for searching/foraging are discussed. We then perform a Multifractal Detrended Fluctuation Analysis (MF-DFA) over the time series of jump magnitudes in the eye trajectory and find that it exhibits a typical multifractal behavior arising from the sequential combination of saccades and fixations. By inspecting the time series composed of only fixational movements, our results reveal instead a monofractal behavior with a Hurst exponent , which indicates the presence of long-range power-law positive correlations (statistical persistence). We expect that our methodological approach can be adopted as a way to understand persistence and strategy-planning during visual search. Nature Publishing Group 2016-02-11 /pmc/articles/PMC4807769/ /pubmed/26864680 http://dx.doi.org/10.1038/srep20815 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Amor, Tatiana A. Reis, Saulo D. S. Campos, Daniel Herrmann, Hans J. Andrade, José S.
spellingShingle	Amor, Tatiana A. Reis, Saulo D. S. Campos, Daniel Herrmann, Hans J. Andrade, José S. Persistence in eye movement during visual search
author_facet	Amor, Tatiana A. Reis, Saulo D. S. Campos, Daniel Herrmann, Hans J. Andrade, José S.
author_sort	Amor, Tatiana A.
title	Persistence in eye movement during visual search
title_short	Persistence in eye movement during visual search
title_full	Persistence in eye movement during visual search
title_fullStr	Persistence in eye movement during visual search
title_full_unstemmed	Persistence in eye movement during visual search
title_sort	persistence in eye movement during visual search
description	As any cognitive task, visual search involves a number of underlying processes that cannot be directly observed and measured. In this way, the movement of the eyes certainly represents the most explicit and closest connection we can get to the inner mechanisms governing this cognitive activity. Here we show that the process of eye movement during visual search, consisting of sequences of fixations intercalated by saccades, exhibits distinctive persistent behaviors. Initially, by focusing on saccadic directions and intersaccadic angles, we disclose that the probability distributions of these measures show a clear preference of participants towards a reading-like mechanism (geometrical persistence), whose features and potential advantages for searching/foraging are discussed. We then perform a Multifractal Detrended Fluctuation Analysis (MF-DFA) over the time series of jump magnitudes in the eye trajectory and find that it exhibits a typical multifractal behavior arising from the sequential combination of saccades and fixations. By inspecting the time series composed of only fixational movements, our results reveal instead a monofractal behavior with a Hurst exponent , which indicates the presence of long-range power-law positive correlations (statistical persistence). We expect that our methodological approach can be adopted as a way to understand persistence and strategy-planning during visual search.
publisher	Nature Publishing Group
publishDate	2016
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4807769/
_version_	1613557761509949440

Persistence in eye movement during visual search

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