Phonetic categorization relies on motor simulation, but combinatorial phonological computations are abstract.

Autor: Berent I; Department of Psychology, Northeastern University, Boston, MA, USA. i.berent@northeastern.edu., Fried PJ; Berenson-Allen Center for Noninvasive Brain Stimulation, Beth Israel Deaconess Medical Center, Boston, MA, USA.; Department of Neurology, Harvard Medical School, Boston, MA, USA., Theodore RM; Department of Speech, Language, and Hearing Sciences, University of Connecticut, Storrs, USA., Manning D; Berenson-Allen Center for Noninvasive Brain Stimulation, Beth Israel Deaconess Medical Center, Boston, MA, USA., Pascual-Leone A; Department of Neurology, Harvard Medical School, Boston, MA, USA.; Hinda and Arthur Marcus Institute for Aging Research, Deanna and Sidney Center for Memory Health, Hebrew SeniorLife, Boston, MA, USA.; Guttmann Brain Health Institute, Barcelona, Spain.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2023 Jan 17; Vol. 13 (1), pp. 874. Date of Electronic Publication: 2023 Jan 17.
DOI: 10.1038/s41598-023-28099-w
Abstrakt: To identify a spoken word (e.g., dog), people must categorize the speech steam onto distinct units (e.g., contrast dog/fog,) and extract their combinatorial structure (e.g., distinguish dog/god). However, the mechanisms that support these two core functions are not fully understood. Here, we explore this question using transcranial magnetic stimulation (TMS). We show that speech categorization engages the motor system, as stimulating the lip motor area has opposite effects on labial (ba/pa)- and coronal (da/ta) sounds. In contrast, the combinatorial computation of syllable structure engages Broca's area, as its stimulation disrupts sensitivity to syllable structure (compared to motor stimulation). We conclude that the two ingredients of language-categorization and combination-are distinct functions in human brains.
(© 2023. The Author(s).)
Databáze: MEDLINE
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