The Precentral Gyrus Contributions to the Early Time-Course of Grapheme-to-Phoneme Conversion.
audiovisual integration
electrocorticography
graphemes
phonemes
reading
Journal
Neurobiology of language (Cambridge, Mass.)
ISSN: 2641-4368
Titre abrégé: Neurobiol Lang (Camb)
Pays: United States
ID NLM: 101763589
Informations de publication
Date de publication:
2022
2022
Historique:
received:
29
07
2020
accepted:
16
06
2021
medline:
10
2
2022
pubmed:
10
2
2022
entrez:
22
5
2023
Statut:
epublish
Résumé
As part of silent reading models, visual orthographic information is transduced into an auditory phonological code in a process of grapheme-to-phoneme conversion (GPC). This process is often identified with lateral temporal-parietal regions associated with auditory phoneme encoding. However, the role of articulatory phonemic representations and the precentral gyrus in GPC is ambiguous. Though the precentral gyrus is implicated in many functional MRI studies of reading, it is not clear if the time course of activity in this region is consistent with the precentral gyrus being involved in GPC. We recorded cortical electrophysiology during a bimodal match/mismatch task from eight patients with perisylvian subdural electrodes to examine the time course of neural activity during a task that necessitated GPC. Patients made a match/mismatch decision between a 3-letter string and the following auditory bi-phoneme. We characterized the distribution and timing of evoked broadband high gamma (70-170 Hz) as well as phase-locking between electrodes. The precentral gyrus emerged with a high concentration of broadband high gamma responses to visual and auditory language as well as mismatch effects. The pars opercularis, supramarginal gyrus, and superior temporal gyrus were also involved. The precentral gyrus showed strong phase-locking with the caudal fusiform gyrus during letter-string presentation and with surrounding perisylvian cortex during the bimodal visual-auditory comparison period. These findings hint at a role for precentral cortex in transducing visual into auditory codes during silent reading.
Identifiants
pubmed: 37215328
doi: 10.1162/nol_a_00047
pii: nol_a_00047
pmc: PMC10158576
doi:
Types de publication
Journal Article
Langues
eng
Pagination
18-45Informations de copyright
© 2021 Massachusetts Institute of Technology.
Déclaration de conflit d'intérêts
Competing Interests: The authors have declared that no competing interests exist.
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