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An ERP study of continuous speech processing. I. Segmentation, semantics, and syntax in native speakers.

Lisa D Sanders1, Helen J Neville

  • 1Department of Psychology, University of Oregon, Eugene, OR, USA. lsanders@wam.umd.edu

Brain Research. Cognitive Brain Research
|January 16, 2003
PubMed
Summary

This study used event-related potentials (ERPs) to investigate how the brain segments speech. Results show that neither semantic nor syntactic information is necessary for initial word segmentation during natural speech processing.

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Area of Science:

  • Cognitive Neuroscience
  • Psycholinguistics
  • Auditory Processing

Background:

  • Speech segmentation is crucial for understanding spoken language.
  • Previous research relied on behavioral measures, potentially missing real-time processing.
  • Online measures are needed to understand natural speech segmentation.

Purpose of the Study:

  • To investigate online speech segmentation using event-related potentials (ERPs).
  • To determine the role of semantic and syntactic information in word-onset segmentation.
  • To identify neural components associated with natural speech processing.

Main Methods:

  • Measured ERPs to word-initial vs. word-medial syllables.
  • Equated syllables for loudness, length, and phonemic content.

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  • Compared ERPs in sentences with varying semantic and syntactic complexity.

    • Main Results:

    • Word-initial syllables elicited a larger early sensory component (N100).
    • The word-onset segmentation effect was observed regardless of semantic or syntactic content.
    • Additional ERP components reflected general semantic and syntactic processing.

    Conclusions:

    • The brain segments words in continuous speech online, independent of higher-level linguistic information.
    • Early sensory processing (N100) is involved in identifying word onsets.
    • Further research can explore the neural basis of semantic and syntactic processing in speech.