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The dynamic nature of speech perception.
James M McQueen1, Dennis Norris, Anne Cutler
1Max Planck Institute for Psycholinguistics, Nijmegen, The Netherlands. james.mcqueen@mpi.nl
Language and Speech
|August 23, 2006
Summary
Listeners automatically adjust speech perception to new sounds, even without explicit lexical decisions. This learning effect demonstrates flexible phonetic interpretation in speech processing.
Area of Science:
- Psycholinguistics
- Auditory Perception
- Phonetics
Background:
- Speech perception requires flexibility to accommodate speaker variability and language changes.
- Listeners utilize lexical knowledge to adapt their perception of novel speech sounds.
- Previous studies showed lexical decisions influence phonetic categorization.
Purpose of the Study:
- To investigate whether explicit lexical judgments are necessary for perceptual learning of speech sounds.
- To determine if automatic retuning of acoustic-phonetic information occurs without explicit task demands.
Main Methods:
- Dutch listeners were exposed to spoken stimuli with ambiguous fricatives in biased lexical contexts.
- Exposure task involved counting stimuli instead of making lexical decisions.
- A subsequent categorization test assessed perception of sounds along an [f]-[s] continuum.
Main Results:
- Categorization results were identical to a previous study where listeners made lexical decisions.
- Listeners showed similar adjustments in fricative perception regardless of the exposure task.
- Perceptual learning occurred even when listeners did not explicitly judge the words.
Conclusions:
- Speech perception adjustments do not rely on explicit judgments during exposure.
- Learning effects reflect automatic retuning of acoustic-phonetic information interpretation.
- This highlights the brain's automatic adaptation mechanisms in speech processing.