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Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

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An Automated System for Sound Localization Testing in Hearing-Impaired Listeners
07:52

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Published on: March 13, 2026

Localization of sublexical speech perception components.

Peter E Turkeltaub1, H Branch Coslett

  • 1Department of Neurology, University of Pennsylvania, 3400 Spruce Street, 3 West Gates Building, Philadelphia, PA 19104, USA. Peter.turkeltaub@uphs.upenn.edu

Brain and Language
|April 24, 2010
PubMed
Summary
This summary is machine-generated.

This study refines speech perception models by pinpointing brain regions for sublexical processing. Neuroimaging reveals key areas in temporal and frontal lobes for acoustic, phonetic, and phonological analysis, enhancing our understanding of speech sound discrimination.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Psycholinguistics

Background:

  • Current models of speech perception accurately identify major cortical regions but lack precision in localizing and lateralizing processing units.
  • Refining these models is crucial for a comprehensive understanding of how the brain processes spoken language.

Purpose of the Study:

  • To conduct Activation Likelihood Estimation (ALE) meta-analyses to refine models of sublexical speech perception.
  • To precisely map the localization and lateralization of brain regions involved in phonetic, phonological, and categorical phoneme processing.

Main Methods:

  • Performed two ALE meta-analyses on neuroimaging literature, specifically fMRI experiments (n=23 for sublexical, n=8 for phoneme perception).
  • Analyzed reported foci to identify significant activation likelihoods and performed sub-analyses for phonetic/phonological processes and lateralization.
  • Examined data for categorical phoneme perception to identify specific brain regions involved in discriminating phoneme categories.

Main Results:

  • Identified significant activation likelihoods in bilateral superior temporal cortex and left posterior middle frontal gyrus for sublexical speech perception.
  • Phonetic and phonological processing localized to the left mid-posterior superior temporal sulcus, with temporal lobe processing demonstrating left lateralization, particularly when explicit phonological attention was required.
  • Categorical phoneme perception activated the left supramarginal gyrus and angular gyrus.

Conclusions:

  • The findings specify the locations of dorsal stream processing units in speech perception.
  • Phonetic and phonological processing within the superior temporal sulcus is confirmed as left-lateralized and localized to the mid-posterior region.
  • The supramarginal gyrus and angular gyrus are suggested to play a role in phoneme category discrimination, contributing to a more detailed speech processing network model.