The Brain Network of Naming: A Lesson from Primary Progressive Aphasia.
OBJECTIVE:Word finding depends on the processing of semantic and lexical information, and it involves an intermediate level for mapping semantic-to-lexical information which also subserves lexical-to-semantic mapping during word comprehension. However, the brain regions implementing these components...
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doaj-c0a2d5fce7e64ecfb89934076b58e23a2020-11-24T21:08:12ZengPublic Library of Science (PLoS)PLoS ONE1932-62032016-01-01112e014870710.1371/journal.pone.0148707The Brain Network of Naming: A Lesson from Primary Progressive Aphasia.Raffaella MigliaccioClaire BoutetRomain ValabregueSophie FerrieuxMarie NoguesStéphane LehéricyDidier DormontRichard LevyBruno DuboisMarc TeichmannOBJECTIVE:Word finding depends on the processing of semantic and lexical information, and it involves an intermediate level for mapping semantic-to-lexical information which also subserves lexical-to-semantic mapping during word comprehension. However, the brain regions implementing these components are still controversial and have not been clarified via a comprehensive lesion model encompassing the whole range of language-related cortices. Primary progressive aphasia (PPA), for which anomia is thought to be the most common sign, provides such a model, but the exploration of cortical areas impacting naming in its three main variants and the underlying processing mechanisms is still lacking. METHODS:We addressed this double issue, related to language structure and PPA, with thirty patients (11 semantic, 12 logopenic, 7 agrammatic variant) using a picture-naming task and voxel-based morphometry for anatomo-functional correlation. First, we analyzed correlations for each of the three variants to identify the regions impacting naming in PPA and to disentangle the core regions of word finding. We then combined the three variants and correlation analyses for naming (semantic-to-lexical mapping) and single-word comprehension (lexical-to-semantic mapping), predicting an overlap zone corresponding to a bidirectional lexical-semantic hub. RESULTS AND CONCLUSIONS:Our results showed that superior portions of the left temporal pole and left posterior temporal cortices impact semantic and lexical naming mechanisms in semantic and logopenic PPA, respectively. In agrammatic PPA naming deficits were rare, and did not correlate with any cortical region. Combined analyses revealed a cortical overlap zone in superior/middle mid-temporal cortices, distinct from the two former regions, impacting bidirectional binding of lexical and semantic information. Altogether, our findings indicate that lexical/semantic word processing depends on an anterior-posterior axis within lateral-temporal cortices, including an anatomically intermediate hub dedicated to lexical-semantic integration. Within this axis our data reveal the underpinnings of anomia in the PPA variants, which is of relevance for both diagnosis and future therapy strategies.http://europepmc.org/articles/PMC4764674?pdf=render |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Raffaella Migliaccio Claire Boutet Romain Valabregue Sophie Ferrieux Marie Nogues Stéphane Lehéricy Didier Dormont Richard Levy Bruno Dubois Marc Teichmann |
spellingShingle |
Raffaella Migliaccio Claire Boutet Romain Valabregue Sophie Ferrieux Marie Nogues Stéphane Lehéricy Didier Dormont Richard Levy Bruno Dubois Marc Teichmann The Brain Network of Naming: A Lesson from Primary Progressive Aphasia. PLoS ONE |
author_facet |
Raffaella Migliaccio Claire Boutet Romain Valabregue Sophie Ferrieux Marie Nogues Stéphane Lehéricy Didier Dormont Richard Levy Bruno Dubois Marc Teichmann |
author_sort |
Raffaella Migliaccio |
title |
The Brain Network of Naming: A Lesson from Primary Progressive Aphasia. |
title_short |
The Brain Network of Naming: A Lesson from Primary Progressive Aphasia. |
title_full |
The Brain Network of Naming: A Lesson from Primary Progressive Aphasia. |
title_fullStr |
The Brain Network of Naming: A Lesson from Primary Progressive Aphasia. |
title_full_unstemmed |
The Brain Network of Naming: A Lesson from Primary Progressive Aphasia. |
title_sort |
brain network of naming: a lesson from primary progressive aphasia. |
publisher |
Public Library of Science (PLoS) |
series |
PLoS ONE |
issn |
1932-6203 |
publishDate |
2016-01-01 |
description |
OBJECTIVE:Word finding depends on the processing of semantic and lexical information, and it involves an intermediate level for mapping semantic-to-lexical information which also subserves lexical-to-semantic mapping during word comprehension. However, the brain regions implementing these components are still controversial and have not been clarified via a comprehensive lesion model encompassing the whole range of language-related cortices. Primary progressive aphasia (PPA), for which anomia is thought to be the most common sign, provides such a model, but the exploration of cortical areas impacting naming in its three main variants and the underlying processing mechanisms is still lacking. METHODS:We addressed this double issue, related to language structure and PPA, with thirty patients (11 semantic, 12 logopenic, 7 agrammatic variant) using a picture-naming task and voxel-based morphometry for anatomo-functional correlation. First, we analyzed correlations for each of the three variants to identify the regions impacting naming in PPA and to disentangle the core regions of word finding. We then combined the three variants and correlation analyses for naming (semantic-to-lexical mapping) and single-word comprehension (lexical-to-semantic mapping), predicting an overlap zone corresponding to a bidirectional lexical-semantic hub. RESULTS AND CONCLUSIONS:Our results showed that superior portions of the left temporal pole and left posterior temporal cortices impact semantic and lexical naming mechanisms in semantic and logopenic PPA, respectively. In agrammatic PPA naming deficits were rare, and did not correlate with any cortical region. Combined analyses revealed a cortical overlap zone in superior/middle mid-temporal cortices, distinct from the two former regions, impacting bidirectional binding of lexical and semantic information. Altogether, our findings indicate that lexical/semantic word processing depends on an anterior-posterior axis within lateral-temporal cortices, including an anatomically intermediate hub dedicated to lexical-semantic integration. Within this axis our data reveal the underpinnings of anomia in the PPA variants, which is of relevance for both diagnosis and future therapy strategies. |
url |
http://europepmc.org/articles/PMC4764674?pdf=render |
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