Eye movements discriminate fatigue due to chronotypical factors and time spent on task--a double dissociation.

Systematic differences in circadian rhythmicity are thought to be a substantial factor determining inter-individual differences in fatigue and cognitive performance. The synchronicity effect (when time of testing coincides with the respective circadian peak period) seems to play an important role. E...

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Autores principales:	Dario Cazzoli, Chrystalina A Antoniades, Christopher Kennard, Thomas Nyffeler, Claudio L Bassetti, René M Müri
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/630941d768c14dd6a6723e29e3a0840b
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spelling	oai:doaj.org-article:630941d768c14dd6a6723e29e3a0840b2021-11-18T08:36:17ZEye movements discriminate fatigue due to chronotypical factors and time spent on task--a double dissociation.1932-620310.1371/journal.pone.0087146https://doaj.org/article/630941d768c14dd6a6723e29e3a0840b2014-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24466334/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203Systematic differences in circadian rhythmicity are thought to be a substantial factor determining inter-individual differences in fatigue and cognitive performance. The synchronicity effect (when time of testing coincides with the respective circadian peak period) seems to play an important role. Eye movements have been shown to be a reliable indicator of fatigue due to sleep deprivation or time spent on cognitive tasks. However, eye movements have not been used so far to investigate the circadian synchronicity effect and the resulting differences in fatigue. The aim of the present study was to assess how different oculomotor parameters in a free visual exploration task are influenced by: a) fatigue due to chronotypical factors (being a 'morning type' or an 'evening type'); b) fatigue due to the time spent on task. Eighteen healthy participants performed a free visual exploration task of naturalistic pictures while their eye movements were recorded. The task was performed twice, once at their optimal and once at their non-optimal time of the day. Moreover, participants rated their subjective fatigue. The non-optimal time of the day triggered a significant and stable increase in the mean visual fixation duration during the free visual exploration task for both chronotypes. The increase in the mean visual fixation duration correlated with the difference in subjectively perceived fatigue at optimal and non-optimal times of the day. Conversely, the mean saccadic speed significantly and progressively decreased throughout the duration of the task, but was not influenced by the optimal or non-optimal time of the day for both chronotypes. The results suggest that different oculomotor parameters are discriminative for fatigue due to different sources. A decrease in saccadic speed seems to reflect fatigue due to time spent on task, whereas an increase in mean fixation duration a lack of synchronicity between chronotype and time of the day.Dario CazzoliChrystalina A AntoniadesChristopher KennardThomas NyffelerClaudio L BassettiRené M MüriPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 1, p e87146 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Dario Cazzoli Chrystalina A Antoniades Christopher Kennard Thomas Nyffeler Claudio L Bassetti René M Müri Eye movements discriminate fatigue due to chronotypical factors and time spent on task--a double dissociation.
description	Systematic differences in circadian rhythmicity are thought to be a substantial factor determining inter-individual differences in fatigue and cognitive performance. The synchronicity effect (when time of testing coincides with the respective circadian peak period) seems to play an important role. Eye movements have been shown to be a reliable indicator of fatigue due to sleep deprivation or time spent on cognitive tasks. However, eye movements have not been used so far to investigate the circadian synchronicity effect and the resulting differences in fatigue. The aim of the present study was to assess how different oculomotor parameters in a free visual exploration task are influenced by: a) fatigue due to chronotypical factors (being a 'morning type' or an 'evening type'); b) fatigue due to the time spent on task. Eighteen healthy participants performed a free visual exploration task of naturalistic pictures while their eye movements were recorded. The task was performed twice, once at their optimal and once at their non-optimal time of the day. Moreover, participants rated their subjective fatigue. The non-optimal time of the day triggered a significant and stable increase in the mean visual fixation duration during the free visual exploration task for both chronotypes. The increase in the mean visual fixation duration correlated with the difference in subjectively perceived fatigue at optimal and non-optimal times of the day. Conversely, the mean saccadic speed significantly and progressively decreased throughout the duration of the task, but was not influenced by the optimal or non-optimal time of the day for both chronotypes. The results suggest that different oculomotor parameters are discriminative for fatigue due to different sources. A decrease in saccadic speed seems to reflect fatigue due to time spent on task, whereas an increase in mean fixation duration a lack of synchronicity between chronotype and time of the day.
format	article
author	Dario Cazzoli Chrystalina A Antoniades Christopher Kennard Thomas Nyffeler Claudio L Bassetti René M Müri
author_facet	Dario Cazzoli Chrystalina A Antoniades Christopher Kennard Thomas Nyffeler Claudio L Bassetti René M Müri
author_sort	Dario Cazzoli
title	Eye movements discriminate fatigue due to chronotypical factors and time spent on task--a double dissociation.
title_short	Eye movements discriminate fatigue due to chronotypical factors and time spent on task--a double dissociation.
title_full	Eye movements discriminate fatigue due to chronotypical factors and time spent on task--a double dissociation.
title_fullStr	Eye movements discriminate fatigue due to chronotypical factors and time spent on task--a double dissociation.
title_full_unstemmed	Eye movements discriminate fatigue due to chronotypical factors and time spent on task--a double dissociation.
title_sort	eye movements discriminate fatigue due to chronotypical factors and time spent on task--a double dissociation.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/630941d768c14dd6a6723e29e3a0840b
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Eye movements discriminate fatigue due to chronotypical factors and time spent on task--a double dissociation.

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