Low-Frequency Oscillations Code Speech during Verbal Working Memory.
electrocorticography
memory representations
sentence repetition
speech perception
speech production
temporal pattern similarity
Journal
The Journal of neuroscience : the official journal of the Society for Neuroscience
ISSN: 1529-2401
Titre abrégé: J Neurosci
Pays: United States
ID NLM: 8102140
Informations de publication
Date de publication:
14 08 2019
14 08 2019
Historique:
received:
03
01
2019
revised:
09
05
2019
accepted:
10
05
2019
pubmed:
15
6
2019
medline:
23
6
2020
entrez:
15
6
2019
Statut:
ppublish
Résumé
The way the human brain represents speech in memory is still unknown. An obvious characteristic of speech is its evolvement over time. During speech processing, neural oscillations are modulated by the temporal properties of the acoustic speech signal, but also acquired knowledge on the temporal structure of language influences speech perception-related brain activity. This suggests that speech could be represented in the temporal domain, a form of representation that the brain also uses to encode autobiographic memories. Empirical evidence for such a memory code is lacking. We investigated the nature of speech memory representations using direct cortical recordings in the left perisylvian cortex during delayed sentence reproduction in female and male patients undergoing awake tumor surgery. Our results reveal that the brain endogenously represents speech in the temporal domain. Temporal pattern similarity analyses revealed that the phase of frontotemporal low-frequency oscillations, primarily in the beta range, represents sentence identity in working memory. The positive relationship between beta power during working memory and task performance suggests that working memory representations benefit from increased phase separation.
Identifiants
pubmed: 31196933
pii: JNEUROSCI.0018-19.2019
doi: 10.1523/JNEUROSCI.0018-19.2019
pmc: PMC6697399
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
6498-6512Informations de copyright
Copyright © 2019 the authors.
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