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Related Experiment Videos

Locating the initial stages of speech-sound processing in human temporal cortex.

Stefan Uppenkamp1, Ingrid S Johnsrude, Dennis Norris

  • 1Centre for the Neural Basis of Hearing, Department of Physiology, University of Cambridge, Cambridge CB2 3EG, UK. stefan.uppenkamp@uni-oldenburg.de

Neuroimage
|March 1, 2006
PubMed
Summary

The brain distinguishes speech from other sounds in the superior temporal sulcus, not in early auditory cortex. This finding supports a hierarchical auditory processing model for speech perception.

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Speech Processing

Background:

  • The auditory system processes all sounds similarly in the cochlea and brainstem.
  • A distinction between speech and nonspeech sounds must occur at some stage in auditory processing.

Purpose of the Study:

  • To identify the earliest location in the auditory pathway that differentiates speech sounds from nonspeech sounds.
  • To investigate differential sensitivity to the internal structure of speech versus matched nonspeech sounds using functional MRI.

Main Methods:

  • Functional MRI (fMRI) was used to analyze brain activity in nine volunteers.
  • Participants listened to natural and synthetic vowels (speech sounds) and matched nonspeech stimuli.
  • Stimuli were matched for long-term energy, spectral, and temporal profiles.

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Main Results:

  • Vowel sounds elicited greater activation than nonspeech sounds in a bilateral region of the superior temporal sulcus.
  • This region is located lateral and inferior to auditory cortex areas activated by both sound types.
  • Auditory cortex regions showed indiscriminate activation for both speech and nonspeech stimuli.

Conclusions:

  • The superior temporal sulcus is an early locus for distinguishing speech sounds.
  • Findings support a hierarchical model of auditory processing where higher cortical regions, beyond primary auditory cortex, exhibit speech-specific selectivity.
  • This suggests a progression from general sound processing to specialized speech perception in the brain.