Early-latency categorical speech sound representations in the left inferior frontal gyrus

NeuroImage
Jussi AlhoIiro P Jääskeläinen

Abstract

Efficient speech perception requires the mapping of highly variable acoustic signals to distinct phonetic categories. How the brain overcomes this many-to-one mapping problem has remained unresolved. To infer the cortical location, latency, and dependency on attention of categorical speech sound representations in the human brain, we measured stimulus-specific adaptation of neuromagnetic responses to sounds from a phonetic continuum. The participants attended to the sounds while performing a non-phonetic listening task and, in a separate recording condition, ignored the sounds while watching a silent film. Neural adaptation indicative of phoneme category selectivity was found only during the attentive condition in the pars opercularis (POp) of the left inferior frontal gyrus, where the degree of selectivity correlated with the ability of the participants to categorize the phonetic stimuli. Importantly, these category-specific representations were activated at an early latency of 115-140 ms, which is compatible with the speed of perceptual phonetic categorization. Further, concurrent functional connectivity was observed between POp and posterior auditory cortical areas. These novel findings suggest that when humans attend to spe...Continue Reading

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Citations

Oct 7, 2016·Frontiers in Human Neuroscience·Malte R Schomers, Friedemann Pulvermüller
Jan 24, 2017·The European Journal of Neuroscience·Gavin M Bidelman, Breya S Walker
Mar 29, 2019·Nature Reviews. Neuroscience·Kyle JasminSophie K Scott
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Jun 27, 2019·Cerebral Cortex·Deborah F Levy, Stephen M Wilson
Mar 18, 2020·Frontiers in Neuroscience·Gavin M BidelmanAlex M Boudreaux
Dec 23, 2017·Brain and Language·Einat Liebenthal, Riikka Möttönen
Mar 11, 2021·Journal of Neural Engineering·Md Sultan MahmudGavin M Bidelman
Aug 17, 2021·Neurobiology of Language·Sara D BeachDimitrios Pantazis

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