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The Brain’s Dorsal Route for Speech Represents Word Meaning: Evidence from Gesture

The dual-route model of speech processing includes a dorsal stream that maps auditory to motor features at the sublexical level rather than at the lexico-semantic level. However, the literature on gesture is an invitation to revise this model because it suggests that the premotor cortex of the dorsa...

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Autores principales: Josse, Goulven, Joseph, Sabine, Bertasi, Eric, Giraud, Anne-Lise
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2012
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3458812/
https://www.ncbi.nlm.nih.gov/pubmed/23049951
http://dx.doi.org/10.1371/journal.pone.0046108
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author Josse, Goulven
Joseph, Sabine
Bertasi, Eric
Giraud, Anne-Lise
author_facet Josse, Goulven
Joseph, Sabine
Bertasi, Eric
Giraud, Anne-Lise
author_sort Josse, Goulven
collection PubMed
description The dual-route model of speech processing includes a dorsal stream that maps auditory to motor features at the sublexical level rather than at the lexico-semantic level. However, the literature on gesture is an invitation to revise this model because it suggests that the premotor cortex of the dorsal route is a major site of lexico-semantic interaction. Here we investigated lexico-semantic mapping using word-gesture pairs that were either congruent or incongruent. Using fMRI-adaptation in 28 subjects, we found that temporo-parietal and premotor activity during auditory processing of single action words was modulated by the prior audiovisual context in which the words had been repeated. The BOLD signal was suppressed following repetition of the auditory word alone, and further suppressed following repetition of the word accompanied by a congruent gesture (e.g. [“grasp” + grasping gesture]). Conversely, repetition suppression was not observed when the same action word was accompanied by an incongruent gesture (e.g. [“grasp” + sprinkle]). We propose a simple model to explain these results: auditory and visual information converge onto premotor cortex where it is represented in a comparable format to determine (in)congruence between speech and gesture. This ability of the dorsal route to detect audiovisual semantic (in)congruence suggests that its function is not restricted to the sublexical level.
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spelling pubmed-34588122012-10-03 The Brain’s Dorsal Route for Speech Represents Word Meaning: Evidence from Gesture Josse, Goulven Joseph, Sabine Bertasi, Eric Giraud, Anne-Lise PLoS One Research Article The dual-route model of speech processing includes a dorsal stream that maps auditory to motor features at the sublexical level rather than at the lexico-semantic level. However, the literature on gesture is an invitation to revise this model because it suggests that the premotor cortex of the dorsal route is a major site of lexico-semantic interaction. Here we investigated lexico-semantic mapping using word-gesture pairs that were either congruent or incongruent. Using fMRI-adaptation in 28 subjects, we found that temporo-parietal and premotor activity during auditory processing of single action words was modulated by the prior audiovisual context in which the words had been repeated. The BOLD signal was suppressed following repetition of the auditory word alone, and further suppressed following repetition of the word accompanied by a congruent gesture (e.g. [“grasp” + grasping gesture]). Conversely, repetition suppression was not observed when the same action word was accompanied by an incongruent gesture (e.g. [“grasp” + sprinkle]). We propose a simple model to explain these results: auditory and visual information converge onto premotor cortex where it is represented in a comparable format to determine (in)congruence between speech and gesture. This ability of the dorsal route to detect audiovisual semantic (in)congruence suggests that its function is not restricted to the sublexical level. Public Library of Science 2012-09-26 /pmc/articles/PMC3458812/ /pubmed/23049951 http://dx.doi.org/10.1371/journal.pone.0046108 Text en © 2012 Josse 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, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Josse, Goulven
Joseph, Sabine
Bertasi, Eric
Giraud, Anne-Lise
The Brain’s Dorsal Route for Speech Represents Word Meaning: Evidence from Gesture
title The Brain’s Dorsal Route for Speech Represents Word Meaning: Evidence from Gesture
title_full The Brain’s Dorsal Route for Speech Represents Word Meaning: Evidence from Gesture
title_fullStr The Brain’s Dorsal Route for Speech Represents Word Meaning: Evidence from Gesture
title_full_unstemmed The Brain’s Dorsal Route for Speech Represents Word Meaning: Evidence from Gesture
title_short The Brain’s Dorsal Route for Speech Represents Word Meaning: Evidence from Gesture
title_sort brain’s dorsal route for speech represents word meaning: evidence from gesture
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3458812/
https://www.ncbi.nlm.nih.gov/pubmed/23049951
http://dx.doi.org/10.1371/journal.pone.0046108
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