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Related Experiment Videos

Perceptual learning in speech.

Dennis Norris1, James M McQueen, Anne Cutler

  • 1MRC Cognition and Brain Sciences Unit, 15 Chaucer Road, Cambridge CB2 2EF, UK. dennis.norris@mrc-cbu.cam.ac.uk

Cognitive Psychology
|September 2, 2003
PubMed
Summary
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Listeners use word knowledge to learn speech sounds. This study shows that hearing ambiguous sounds in known words helps listeners better identify those sounds, improving speech perception and adaptation to new speech patterns.

Area of Science:

  • Psycholinguistics
  • Auditory Perception
  • Speech Science

Background:

  • Speech perception involves processing sounds within a linguistic context.
  • Perceptual learning allows listeners to adapt to variations in speech.
  • The role of lexical knowledge in training speech sound categorization is not fully understood.

Purpose of the Study:

  • To investigate whether listeners utilize lexical knowledge for perceptual learning of speech sounds.
  • To determine if exposure to ambiguous speech sounds within real words influences subsequent sound categorization.
  • To differentiate lexical learning from on-line lexical feedback mechanisms.

Main Methods:

  • Dutch listeners performed lexical decisions on real words and nonwords.
  • Ambiguous fricative sounds ([f]/[s] continuum) were embedded in word-final positions.

Related Experiment Videos

  • Participants were exposed to different combinations of ambiguous and unambiguous word endings.
  • Subsequent categorization of ambiguous sounds was measured.

    • Main Results:

    • Listeners exposed to ambiguous sounds in [f]-final words were more likely to categorize ambiguous sounds as [f].
    • Conversely, listeners exposed to ambiguous sounds in [s]-final words showed a bias towards categorizing sounds as [s].
    • Control conditions excluded alternative explanations like selective adaptation or contrast effects.

    Conclusions:

    • Lexical information is actively used by listeners to train speech sound categorization.
    • This lexical learning mechanism aids spoken word recognition, particularly in adapting to novel speech variations like new dialects.
    • This differs from on-line feedback models, highlighting a distinct role for lexical knowledge in speech perception learning.