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Flexibility and Stability in Sensory Processing Revealed Using Visual-to-Auditory Sensory Substitution
The classical view of sensory processing involves independent processing in sensory cortices and multisensory integration in associative areas. This hierarchical structure has been challenged by evidence of multisensory responses in sensory areas, and dynamic weighting of sensory inputs in associati...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Oxford University Press
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4494022/ https://www.ncbi.nlm.nih.gov/pubmed/24518756 http://dx.doi.org/10.1093/cercor/bhu010 |
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author | Hertz, Uri Amedi, Amir |
author_facet | Hertz, Uri Amedi, Amir |
author_sort | Hertz, Uri |
collection | PubMed |
description | The classical view of sensory processing involves independent processing in sensory cortices and multisensory integration in associative areas. This hierarchical structure has been challenged by evidence of multisensory responses in sensory areas, and dynamic weighting of sensory inputs in associative areas, thus far reported independently. Here, we used a visual-to-auditory sensory substitution algorithm (SSA) to manipulate the information conveyed by sensory inputs while keeping the stimuli intact. During scan sessions before and after SSA learning, subjects were presented with visual images and auditory soundscapes. The findings reveal 2 dynamic processes. First, crossmodal attenuation of sensory cortices changed direction after SSA learning from visual attenuations of the auditory cortex to auditory attenuations of the visual cortex. Secondly, associative areas changed their sensory response profile from strongest response for visual to that for auditory. The interaction between these phenomena may play an important role in multisensory processing. Consistent features were also found in the sensory dominance in sensory areas and audiovisual convergence in associative area Middle Temporal Gyrus. These 2 factors allow for both stability and a fast, dynamic tuning of the system when required. |
format | Online Article Text |
id | pubmed-4494022 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Oxford University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-44940222015-07-09 Flexibility and Stability in Sensory Processing Revealed Using Visual-to-Auditory Sensory Substitution Hertz, Uri Amedi, Amir Cereb Cortex Articles The classical view of sensory processing involves independent processing in sensory cortices and multisensory integration in associative areas. This hierarchical structure has been challenged by evidence of multisensory responses in sensory areas, and dynamic weighting of sensory inputs in associative areas, thus far reported independently. Here, we used a visual-to-auditory sensory substitution algorithm (SSA) to manipulate the information conveyed by sensory inputs while keeping the stimuli intact. During scan sessions before and after SSA learning, subjects were presented with visual images and auditory soundscapes. The findings reveal 2 dynamic processes. First, crossmodal attenuation of sensory cortices changed direction after SSA learning from visual attenuations of the auditory cortex to auditory attenuations of the visual cortex. Secondly, associative areas changed their sensory response profile from strongest response for visual to that for auditory. The interaction between these phenomena may play an important role in multisensory processing. Consistent features were also found in the sensory dominance in sensory areas and audiovisual convergence in associative area Middle Temporal Gyrus. These 2 factors allow for both stability and a fast, dynamic tuning of the system when required. Oxford University Press 2015-08 2014-02-10 /pmc/articles/PMC4494022/ /pubmed/24518756 http://dx.doi.org/10.1093/cercor/bhu010 Text en © The Author 2014. Published by Oxford University Press. http://creativecommons.org/licenses/by-nc/3.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com |
spellingShingle | Articles Hertz, Uri Amedi, Amir Flexibility and Stability in Sensory Processing Revealed Using Visual-to-Auditory Sensory Substitution |
title | Flexibility and Stability in Sensory Processing Revealed Using Visual-to-Auditory Sensory Substitution |
title_full | Flexibility and Stability in Sensory Processing Revealed Using Visual-to-Auditory Sensory Substitution |
title_fullStr | Flexibility and Stability in Sensory Processing Revealed Using Visual-to-Auditory Sensory Substitution |
title_full_unstemmed | Flexibility and Stability in Sensory Processing Revealed Using Visual-to-Auditory Sensory Substitution |
title_short | Flexibility and Stability in Sensory Processing Revealed Using Visual-to-Auditory Sensory Substitution |
title_sort | flexibility and stability in sensory processing revealed using visual-to-auditory sensory substitution |
topic | Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4494022/ https://www.ncbi.nlm.nih.gov/pubmed/24518756 http://dx.doi.org/10.1093/cercor/bhu010 |
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