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Proc Natl Acad Sci U S A. 2012 Feb 21;109(8):E505-14. doi: 10.1073/pnas.1113427109. Epub 2012 Feb 1.

Phoneme and word recognition in the auditory ventral stream.

Author information

1
Laboratory of Integrative Neuroscience and Cognition, Department of Neuroscience, Georgetown University Medical Center, Washington, DC 20007, USA. id32@georgetown.edu

Abstract

Spoken word recognition requires complex, invariant representations. Using a meta-analytic approach incorporating more than 100 functional imaging experiments, we show that preference for complex sounds emerges in the human auditory ventral stream in a hierarchical fashion, consistent with nonhuman primate electrophysiology. Examining speech sounds, we show that activation associated with the processing of short-timescale patterns (i.e., phonemes) is consistently localized to left mid-superior temporal gyrus (STG), whereas activation associated with the integration of phonemes into temporally complex patterns (i.e., words) is consistently localized to left anterior STG. Further, we show left mid- to anterior STG is reliably implicated in the invariant representation of phonetic forms and that this area also responds preferentially to phonetic sounds, above artificial control sounds or environmental sounds. Together, this shows increasing encoding specificity and invariance along the auditory ventral stream for temporally complex speech sounds.

PMID:
22308358
PMCID:
PMC3286918
DOI:
10.1073/pnas.1113427109
[Indexed for MEDLINE]
Free PMC Article
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