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Audiovisual integration in near and far space: effects of changes in distance and stimulus effectiveness

A factor that is often not considered in multisensory research is the distance from which information is presented. Interestingly, various studies have shown that the distance at which information is presented can modulate the strength of multisensory interactions. In addition, our everyday multisen...

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Autores principales: Van der Stoep, N., Van der Stigchel, S., Nijboer, T. C. W., Van der Smagt, M. J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Berlin Heidelberg 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4828496/
https://www.ncbi.nlm.nih.gov/pubmed/25788009
http://dx.doi.org/10.1007/s00221-015-4248-2
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author Van der Stoep, N.
Van der Stigchel, S.
Nijboer, T. C. W.
Van der Smagt, M. J.
author_facet Van der Stoep, N.
Van der Stigchel, S.
Nijboer, T. C. W.
Van der Smagt, M. J.
author_sort Van der Stoep, N.
collection PubMed
description A factor that is often not considered in multisensory research is the distance from which information is presented. Interestingly, various studies have shown that the distance at which information is presented can modulate the strength of multisensory interactions. In addition, our everyday multisensory experience in near and far space is rather asymmetrical in terms of retinal image size and stimulus intensity. This asymmetry is the result of the relation between the stimulus-observer distance and its retinal image size and intensity: an object that is further away is generally smaller on the retina as compared to the same object when it is presented nearer. Similarly, auditory intensity decreases as the distance from the observer increases. We investigated how each of these factors alone, and their combination, affected audiovisual integration. Unimodal and bimodal stimuli were presented in near and far space, with and without controlling for distance-dependent changes in retinal image size and intensity. Audiovisual integration was enhanced for stimuli that were presented in far space as compared to near space, but only when the stimuli were not corrected for visual angle and intensity. The same decrease in intensity and retinal size in near space did not enhance audiovisual integration, indicating that these results cannot be explained by changes in stimulus efficacy or an increase in distance alone, but rather by an interaction between these factors. The results are discussed in the context of multisensory experience and spatial uncertainty, and underline the importance of studying multisensory integration in the depth space. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s00221-015-4248-2) contains supplementary material, which is available to authorized users.
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spelling pubmed-48284962016-04-21 Audiovisual integration in near and far space: effects of changes in distance and stimulus effectiveness Van der Stoep, N. Van der Stigchel, S. Nijboer, T. C. W. Van der Smagt, M. J. Exp Brain Res Research Article A factor that is often not considered in multisensory research is the distance from which information is presented. Interestingly, various studies have shown that the distance at which information is presented can modulate the strength of multisensory interactions. In addition, our everyday multisensory experience in near and far space is rather asymmetrical in terms of retinal image size and stimulus intensity. This asymmetry is the result of the relation between the stimulus-observer distance and its retinal image size and intensity: an object that is further away is generally smaller on the retina as compared to the same object when it is presented nearer. Similarly, auditory intensity decreases as the distance from the observer increases. We investigated how each of these factors alone, and their combination, affected audiovisual integration. Unimodal and bimodal stimuli were presented in near and far space, with and without controlling for distance-dependent changes in retinal image size and intensity. Audiovisual integration was enhanced for stimuli that were presented in far space as compared to near space, but only when the stimuli were not corrected for visual angle and intensity. The same decrease in intensity and retinal size in near space did not enhance audiovisual integration, indicating that these results cannot be explained by changes in stimulus efficacy or an increase in distance alone, but rather by an interaction between these factors. The results are discussed in the context of multisensory experience and spatial uncertainty, and underline the importance of studying multisensory integration in the depth space. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s00221-015-4248-2) contains supplementary material, which is available to authorized users. Springer Berlin Heidelberg 2015-03-19 2016 /pmc/articles/PMC4828496/ /pubmed/25788009 http://dx.doi.org/10.1007/s00221-015-4248-2 Text en © The Author(s) 2015 https://creativecommons.org/licenses/by/4.0/ Open AccessThis article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.
spellingShingle Research Article
Van der Stoep, N.
Van der Stigchel, S.
Nijboer, T. C. W.
Van der Smagt, M. J.
Audiovisual integration in near and far space: effects of changes in distance and stimulus effectiveness
title Audiovisual integration in near and far space: effects of changes in distance and stimulus effectiveness
title_full Audiovisual integration in near and far space: effects of changes in distance and stimulus effectiveness
title_fullStr Audiovisual integration in near and far space: effects of changes in distance and stimulus effectiveness
title_full_unstemmed Audiovisual integration in near and far space: effects of changes in distance and stimulus effectiveness
title_short Audiovisual integration in near and far space: effects of changes in distance and stimulus effectiveness
title_sort audiovisual integration in near and far space: effects of changes in distance and stimulus effectiveness
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4828496/
https://www.ncbi.nlm.nih.gov/pubmed/25788009
http://dx.doi.org/10.1007/s00221-015-4248-2
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