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Basic auditory processes involved in the analysis of speech sounds.

Brian C J Moore1

  • 1Department of Experimental Psychology, University of Cambridge, Downing Street, Cambridge CB2 3EB, UK. bcjm@cam.ac.uk

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|September 11, 2007
PubMed
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This review explains how auditory processing, including frequency and temporal resolution, shapes speech perception. Understanding these mechanisms reveals why speech is robust in quiet but challenging for those with hearing impairments.

Area of Science:

  • Auditory Neuroscience
  • Speech Perception Science

Background:

  • Auditory processing is fundamental to understanding speech.
  • Key aspects include frequency selectivity, temporal resolution, and spectral analysis.

Purpose of the Study:

  • To review the basic auditory processing mechanisms involved in speech perception.
  • To relate these mechanisms to the internal representation of speech sounds.
  • To explain the robustness of speech perception and its challenges in hearing impairment.

Main Methods:

  • Review of auditory masking experiments to assess frequency selectivity.
  • Analysis of spectral and temporal features of speech sounds.
  • Modeling of auditory resolution using spectro-temporal excitation patterns.

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Main Results:

  • Auditory system's frequency selectivity creates internal excitation patterns of speech spectra.
  • Timbre and vowel quality perception depend on static and dynamic spectral features.
  • Temporal resolution, modeled by a sliding integrator, is crucial for dynamic aspects.
  • Spectro-temporal analysis provides insight into speech sound representation.
  • Auditory resolution typically exceeds speech perception needs in quiet environments.

Conclusions:

  • The auditory system's frequency and temporal resolution contribute to robust speech perception in quiet.
  • Impaired hearing significantly compromises auditory processing, leading to less robust speech perception.
  • Further research into auditory processing can inform strategies for aiding individuals with hearing loss.