The additive nature of the human multisensory evoked pupil response

Abstract Pupillometry has received increased interest for its usefulness in measuring various sensory processes as an alternative to behavioural assessments. This is also apparent for multisensory investigations. Studies of the multisensory pupil response, however, have produced conflicting results....

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Autores principales:	Nathan Van der Stoep, M. J. Van der Smagt, C. Notaro, Z. Spock, M. Naber
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d662544d5fce47d985fc101ba4bd2c0c
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spelling	oai:doaj.org-article:d662544d5fce47d985fc101ba4bd2c0c2021-12-02T15:23:09ZThe additive nature of the human multisensory evoked pupil response10.1038/s41598-020-80286-12045-2322https://doaj.org/article/d662544d5fce47d985fc101ba4bd2c0c2021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-80286-1https://doaj.org/toc/2045-2322Abstract Pupillometry has received increased interest for its usefulness in measuring various sensory processes as an alternative to behavioural assessments. This is also apparent for multisensory investigations. Studies of the multisensory pupil response, however, have produced conflicting results. Some studies observed super-additive multisensory pupil responses, indicative of multisensory integration (MSI). Others observed additive multisensory pupil responses even though reaction time (RT) measures were indicative of MSI. Therefore, in the present study, we investigated the nature of the multisensory pupil response by combining methodological approaches of previous studies while using supra-threshold stimuli only. In two experiments we presented auditory and visual stimuli to observers that evoked a(n) (onset) response (be it constriction or dilation) in a simple detection task and a change detection task. In both experiments, the RT data indicated MSI as shown by race model inequality violation. Still, the multisensory pupil response in both experiments could best be explained by linear summation of the unisensory pupil responses. We conclude that the multisensory pupil response for supra-threshold stimuli is additive in nature and cannot be used as a measure of MSI, as only a departure from additivity can unequivocally demonstrate an interaction between the senses.Nathan Van der StoepM. J. Van der SmagtC. NotaroZ. SpockM. NaberNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Nathan Van der Stoep M. J. Van der Smagt C. Notaro Z. Spock M. Naber The additive nature of the human multisensory evoked pupil response
description	Abstract Pupillometry has received increased interest for its usefulness in measuring various sensory processes as an alternative to behavioural assessments. This is also apparent for multisensory investigations. Studies of the multisensory pupil response, however, have produced conflicting results. Some studies observed super-additive multisensory pupil responses, indicative of multisensory integration (MSI). Others observed additive multisensory pupil responses even though reaction time (RT) measures were indicative of MSI. Therefore, in the present study, we investigated the nature of the multisensory pupil response by combining methodological approaches of previous studies while using supra-threshold stimuli only. In two experiments we presented auditory and visual stimuli to observers that evoked a(n) (onset) response (be it constriction or dilation) in a simple detection task and a change detection task. In both experiments, the RT data indicated MSI as shown by race model inequality violation. Still, the multisensory pupil response in both experiments could best be explained by linear summation of the unisensory pupil responses. We conclude that the multisensory pupil response for supra-threshold stimuli is additive in nature and cannot be used as a measure of MSI, as only a departure from additivity can unequivocally demonstrate an interaction between the senses.
format	article
author	Nathan Van der Stoep M. J. Van der Smagt C. Notaro Z. Spock M. Naber
author_facet	Nathan Van der Stoep M. J. Van der Smagt C. Notaro Z. Spock M. Naber
author_sort	Nathan Van der Stoep
title	The additive nature of the human multisensory evoked pupil response
title_short	The additive nature of the human multisensory evoked pupil response
title_full	The additive nature of the human multisensory evoked pupil response
title_fullStr	The additive nature of the human multisensory evoked pupil response
title_full_unstemmed	The additive nature of the human multisensory evoked pupil response
title_sort	additive nature of the human multisensory evoked pupil response
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/d662544d5fce47d985fc101ba4bd2c0c
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The additive nature of the human multisensory evoked pupil response

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