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Task-uninformative visual stimuli improve auditory spatial discrimination in humans but not the ideal observer
In order to survive and function in the world, we must understand the content of our environment. This requires us to gather and parse complex, sometimes conflicting, information. Yet, the brain is capable of translating sensory stimuli from disparate modalities into a cohesive and accurate percept...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6733465/ https://www.ncbi.nlm.nih.gov/pubmed/31498804 http://dx.doi.org/10.1371/journal.pone.0215417 |
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author | Cappelloni, Madeline S. Shivkumar, Sabyasachi Haefner, Ralf M. Maddox, Ross K. |
author_facet | Cappelloni, Madeline S. Shivkumar, Sabyasachi Haefner, Ralf M. Maddox, Ross K. |
author_sort | Cappelloni, Madeline S. |
collection | PubMed |
description | In order to survive and function in the world, we must understand the content of our environment. This requires us to gather and parse complex, sometimes conflicting, information. Yet, the brain is capable of translating sensory stimuli from disparate modalities into a cohesive and accurate percept with little conscious effort. Previous studies of multisensory integration have suggested that the brain’s integration of cues is well-approximated by an ideal observer implementing Bayesian causal inference. However, behavioral data from tasks that include only one stimulus in each modality fail to capture what is in nature a complex process. Here we employed an auditory spatial discrimination task in which listeners were asked to determine on which side they heard one of two concurrently presented sounds. We compared two visual conditions in which task-uninformative shapes were presented in the center of the screen, or spatially aligned with the auditory stimuli. We found that performance on the auditory task improved when the visual stimuli were spatially aligned with the auditory stimuli—even though the shapes provided no information about which side the auditory target was on. We also demonstrate that a model of a Bayesian ideal observer performing causal inference cannot explain this improvement, demonstrating that humans deviate systematically from the ideal observer model. |
format | Online Article Text |
id | pubmed-6733465 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-67334652019-09-20 Task-uninformative visual stimuli improve auditory spatial discrimination in humans but not the ideal observer Cappelloni, Madeline S. Shivkumar, Sabyasachi Haefner, Ralf M. Maddox, Ross K. PLoS One Research Article In order to survive and function in the world, we must understand the content of our environment. This requires us to gather and parse complex, sometimes conflicting, information. Yet, the brain is capable of translating sensory stimuli from disparate modalities into a cohesive and accurate percept with little conscious effort. Previous studies of multisensory integration have suggested that the brain’s integration of cues is well-approximated by an ideal observer implementing Bayesian causal inference. However, behavioral data from tasks that include only one stimulus in each modality fail to capture what is in nature a complex process. Here we employed an auditory spatial discrimination task in which listeners were asked to determine on which side they heard one of two concurrently presented sounds. We compared two visual conditions in which task-uninformative shapes were presented in the center of the screen, or spatially aligned with the auditory stimuli. We found that performance on the auditory task improved when the visual stimuli were spatially aligned with the auditory stimuli—even though the shapes provided no information about which side the auditory target was on. We also demonstrate that a model of a Bayesian ideal observer performing causal inference cannot explain this improvement, demonstrating that humans deviate systematically from the ideal observer model. Public Library of Science 2019-09-09 /pmc/articles/PMC6733465/ /pubmed/31498804 http://dx.doi.org/10.1371/journal.pone.0215417 Text en © 2019 Cappelloni et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
spellingShingle | Research Article Cappelloni, Madeline S. Shivkumar, Sabyasachi Haefner, Ralf M. Maddox, Ross K. Task-uninformative visual stimuli improve auditory spatial discrimination in humans but not the ideal observer |
title | Task-uninformative visual stimuli improve auditory spatial discrimination in humans but not the ideal observer |
title_full | Task-uninformative visual stimuli improve auditory spatial discrimination in humans but not the ideal observer |
title_fullStr | Task-uninformative visual stimuli improve auditory spatial discrimination in humans but not the ideal observer |
title_full_unstemmed | Task-uninformative visual stimuli improve auditory spatial discrimination in humans but not the ideal observer |
title_short | Task-uninformative visual stimuli improve auditory spatial discrimination in humans but not the ideal observer |
title_sort | task-uninformative visual stimuli improve auditory spatial discrimination in humans but not the ideal observer |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6733465/ https://www.ncbi.nlm.nih.gov/pubmed/31498804 http://dx.doi.org/10.1371/journal.pone.0215417 |
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