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Area of Science:

  • Psycholinguistics
  • Speech Perception
  • Auditory Neuroscience

Background:

  • Lexically guided perceptual learning (LGPL) updates linguistic categories using lexical context.
  • LGPL is crucial for adapting speech perception to novel or variable input.
  • The precise range of acoustic variation that supports LGPL remains incompletely understood.

Purpose of the Study:

  • To investigate the range of acoustic variation that facilitates lexically guided perceptual learning in speech.
  • To determine how different levels of phonetic variation (typical, ambiguous, atypical, remapped) influence LGPL.
  • To examine listener sensitivity to acoustic variation in exposure stimuli.

Main Methods:

  • Experiment 1: Employed an LGPL paradigm using words with noncanonical /s/ realizations varying along s/ʃ continua (typical, ambiguous, atypical, remapped).
  • Speech categorization tasks were used to assess perceptual learning of /s/ and /ʃ/ sounds.
  • Experiment 2: Utilized AX discrimination tasks to measure listener sensitivity to variation in the exposure speech tokens.

Main Results:

  • Listeners demonstrated significant perceptual learning with maximally ambiguous speech tokens.
  • Tokens that elicited the most perceptual learning were not perceptually salient in isolation.
  • Listener sensitivity analysis indicated that maximally ambiguous stimuli were not uniquely salient.

Conclusions:

  • Perceptual learning in speech is optimized by maximally ambiguous stimuli.
  • Highly atypical pronunciations led to reduced perceptual learning, while typical pronunciations showed no learning.
  • LGPL involves an interaction between confidence in phonetic/lexical predictions and the typicality of speech categories.