Network dynamics of Broca’s area during word selection

English version

Autoři: Christopher R. Conner ^aff001; Cihan M. Kadipasaoglu ^aff001; Harel Z. Shouval ^aff003; Gregory Hickok ^aff004; Nitin Tandon ^aff001
Působiště autorů: Vivian L Smith Department of Neurosurgery, University of Texas Medical School at Houston, Houston, TX, United States of America ^aff001; Mischer Neuroscience Institute, Memorial Hermann Hospital, Houston, Texas, United States of America ^aff002; Department of Neurobiology and Anatomy, University of Texas Medical School at Houston, Houston, TX, United States of America ^aff003; Department of Cognitive Sciences, University of California, Irvine, CA, United States of America ^aff004
Vyšlo v časopise: PLoS ONE 14(12)
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.pone.0225756

Souhrn

Current models of word-production in Broca’s area (i.e. left ventro-lateral prefrontal cortex, VLPFC) posit that sequential and staggered semantic, lexical, phonological and articulatory processes precede articulation. Using millisecond-resolution intra-cranial recordings, we evaluated spatiotemporal dynamics and high frequency functional interconnectivity between left VLPFC regions during single-word production. Through the systematic variation of retrieval, selection, and phonological loads, we identified specific activation profiles and functional coupling patterns between these regions that fit within current psycholinguistic theories of word production. However, network interactions underpinning these processes activate in parallel (not sequentially), while the processes themselves are indexed by specific changes in network state. We found evidence that suggests that pars orbitalis is coupled with pars triangularis during lexical retrieval, while lexical selection is terminated via coupled activity with M1 at articulation onset. Taken together, this work reveals that speech production relies on very specific inter-regional couplings in rapid sequence in the language dominant hemisphere.

Klíčová slova:

Functional magnetic resonance imaging – Left hemisphere – Right hemisphere – Language – Semantics – Speech – Phonology – Phonemes

Zdroje

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Network dynamics of Broca’s area during word selection

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