The Brain Differentially Prepares Inner and Overt Speech Production: Electrophysiological and Vascular Evidence.
event-related brain potentials (ERPs)
functional near-infrared spectroscopy (fNIRS)
inner speech
overt speech
speech production
Journal
Brain sciences
ISSN: 2076-3425
Titre abrégé: Brain Sci
Pays: Switzerland
ID NLM: 101598646
Informations de publication
Date de publication:
04 Mar 2020
04 Mar 2020
Historique:
received:
18
12
2019
revised:
06
02
2020
accepted:
28
02
2020
entrez:
8
3
2020
pubmed:
8
3
2020
medline:
8
3
2020
Statut:
epublish
Résumé
Speech production not only relies on spoken (overt speech) but also on silent output (inner speech). Little is known about whether inner and overt speech are processed differently and which neural mechanisms are involved. By simultaneously applying electroencephalography (EEG) and functional near-infrared spectroscopy (fNIRS), we tried to disentangle executive control from motor and linguistic processes. A preparation phase was introduced additionally to the examination of overt and inner speech directly during naming (i.e., speech execution). Participants completed a picture-naming paradigm in which the pure preparation phase of a subsequent speech production and the actual speech execution phase could be differentiated. fNIRS results revealed a larger activation for overt rather than inner speech at bilateral prefrontal to parietal regions during the preparation and at bilateral temporal regions during the execution phase. EEG results showed a larger negativity for inner compared to overt speech between 200 and 500 ms during the preparation phase and between 300 and 500 ms during the execution phase. Findings of the preparation phase indicated that differences between inner and overt speech are not exclusively driven by specific linguistic and motor processes but also impacted by inhibitory mechanisms. Results of the execution phase suggest that inhibitory processes operate during phonological code retrieval and encoding.
Identifiants
pubmed: 32143405
pii: brainsci10030148
doi: 10.3390/brainsci10030148
pmc: PMC7139369
pii:
doi:
Types de publication
Journal Article
Langues
eng
Déclaration de conflit d'intérêts
The authors declare no conflict of interest.
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