Format

Send to

Choose Destination
See comment in PubMed Commons below
Nat Neurosci. 2010 Nov;13(11):1428-32. doi: 10.1038/nn.2641. Epub 2010 Oct 3.

Categorical speech representation in human superior temporal gyrus.

Author information

1
Department of Neurological Surgery, University of California San Francisco, San Francisco, California, USA. changed@neurosurg.ucsf.edu

Abstract

Speech perception requires the rapid and effortless extraction of meaningful phonetic information from a highly variable acoustic signal. A powerful example of this phenomenon is categorical speech perception, in which a continuum of acoustically varying sounds is transformed into perceptually distinct phoneme categories. We found that the neural representation of speech sounds is categorically organized in the human posterior superior temporal gyrus. Using intracranial high-density cortical surface arrays, we found that listening to synthesized speech stimuli varying in small and acoustically equal steps evoked distinct and invariant cortical population response patterns that were organized by their sensitivities to critical acoustic features. Phonetic category boundaries were similar between neurometric and psychometric functions. Although speech-sound responses were distributed, spatially discrete cortical loci were found to underlie specific phonetic discrimination. Our results provide direct evidence for acoustic-to-higher order phonetic level encoding of speech sounds in human language receptive cortex.

Comment in

PMID:
20890293
PMCID:
PMC2967728
DOI:
10.1038/nn.2641
[Indexed for MEDLINE]
Free PMC Article
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Nature Publishing Group Icon for PubMed Central
    Loading ...
    Support Center