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Crossmodal associations modulate multisensory spatial integration

According to the Bayesian framework of multisensory integration, audiovisual stimuli associated with a stronger prior belief that they share a common cause (i.e., causal prior) are predicted to result in a greater degree of perceptual binding and therefore greater audiovisual integration. In the pre...

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Autores principales: Tong, Jonathan, Li, Lux, Bruns, Patrick, Röder, Brigitte
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer US 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7536156/
https://www.ncbi.nlm.nih.gov/pubmed/32627131
http://dx.doi.org/10.3758/s13414-020-02083-2
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author Tong, Jonathan
Li, Lux
Bruns, Patrick
Röder, Brigitte
author_facet Tong, Jonathan
Li, Lux
Bruns, Patrick
Röder, Brigitte
author_sort Tong, Jonathan
collection PubMed
description According to the Bayesian framework of multisensory integration, audiovisual stimuli associated with a stronger prior belief that they share a common cause (i.e., causal prior) are predicted to result in a greater degree of perceptual binding and therefore greater audiovisual integration. In the present psychophysical study, we systematically manipulated the causal prior while keeping sensory evidence constant. We paired auditory and visual stimuli during an association phase to be spatiotemporally either congruent or incongruent, with the goal of driving the causal prior in opposite directions for different audiovisual pairs. Following this association phase, every pairwise combination of the auditory and visual stimuli was tested in a typical ventriloquism-effect (VE) paradigm. The size of the VE (i.e., the shift of auditory localization towards the spatially discrepant visual stimulus) indicated the degree of multisensory integration. Results showed that exposure to an audiovisual pairing as spatiotemporally congruent compared to incongruent resulted in a larger subsequent VE (Experiment 1). This effect was further confirmed in a second VE paradigm, where the congruent and the incongruent visual stimuli flanked the auditory stimulus, and a VE in the direction of the congruent visual stimulus was shown (Experiment 2). Since the unisensory reliabilities for the auditory or visual components did not change after the association phase, the observed effects are likely due to changes in multisensory binding by association learning. As suggested by Bayesian theories of multisensory processing, our findings support the existence of crossmodal causal priors that are flexibly shaped by experience in a changing world. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.3758/s13414-020-02083-2) contains supplementary material, which is available to authorized users.
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spelling pubmed-75361562020-10-19 Crossmodal associations modulate multisensory spatial integration Tong, Jonathan Li, Lux Bruns, Patrick Röder, Brigitte Atten Percept Psychophys Article According to the Bayesian framework of multisensory integration, audiovisual stimuli associated with a stronger prior belief that they share a common cause (i.e., causal prior) are predicted to result in a greater degree of perceptual binding and therefore greater audiovisual integration. In the present psychophysical study, we systematically manipulated the causal prior while keeping sensory evidence constant. We paired auditory and visual stimuli during an association phase to be spatiotemporally either congruent or incongruent, with the goal of driving the causal prior in opposite directions for different audiovisual pairs. Following this association phase, every pairwise combination of the auditory and visual stimuli was tested in a typical ventriloquism-effect (VE) paradigm. The size of the VE (i.e., the shift of auditory localization towards the spatially discrepant visual stimulus) indicated the degree of multisensory integration. Results showed that exposure to an audiovisual pairing as spatiotemporally congruent compared to incongruent resulted in a larger subsequent VE (Experiment 1). This effect was further confirmed in a second VE paradigm, where the congruent and the incongruent visual stimuli flanked the auditory stimulus, and a VE in the direction of the congruent visual stimulus was shown (Experiment 2). Since the unisensory reliabilities for the auditory or visual components did not change after the association phase, the observed effects are likely due to changes in multisensory binding by association learning. As suggested by Bayesian theories of multisensory processing, our findings support the existence of crossmodal causal priors that are flexibly shaped by experience in a changing world. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.3758/s13414-020-02083-2) contains supplementary material, which is available to authorized users. Springer US 2020-07-05 2020 /pmc/articles/PMC7536156/ /pubmed/32627131 http://dx.doi.org/10.3758/s13414-020-02083-2 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Tong, Jonathan
Li, Lux
Bruns, Patrick
Röder, Brigitte
Crossmodal associations modulate multisensory spatial integration
title Crossmodal associations modulate multisensory spatial integration
title_full Crossmodal associations modulate multisensory spatial integration
title_fullStr Crossmodal associations modulate multisensory spatial integration
title_full_unstemmed Crossmodal associations modulate multisensory spatial integration
title_short Crossmodal associations modulate multisensory spatial integration
title_sort crossmodal associations modulate multisensory spatial integration
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7536156/
https://www.ncbi.nlm.nih.gov/pubmed/32627131
http://dx.doi.org/10.3758/s13414-020-02083-2
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