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Stimulus variability and processing dependencies in speech perception.

J W Mullennix1, D B Pisoni

  • 1Department of Psychology, Indiana University, Bloomington 47405.

Perception & Psychophysics
|April 1, 1990
PubMed
Summary
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Speech perception involves understanding voice and phoneme processing. This study found voice and phoneme perception are asymmetrically dependent, with increased variability amplifying interference.

Area of Science:

  • Psycholinguistics
  • Auditory Perception
  • Speech Processing

Background:

  • Understanding how humans process complex auditory information like speech is crucial.
  • Investigating the interplay between talker characteristics (voice) and linguistic content (phoneme) is key to speech perception models.

Purpose of the Study:

  • To investigate the processing dependencies between voice and phoneme perception.
  • To examine how variability in voice and phonetic cues affects speech perception.
  • To explore the relationship between talker normalization and phonetic coding.

Main Methods:

  • Utilized the Garner (1974) speeded classification procedure.
  • Manipulated variability in talker voice and cues to word-initial consonants.
  • Measured processing asymmetry and orthogonal interference between voice and phoneme dimensions.

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Main Results:

  • Demonstrated an asymmetric dependency between voice processing and phoneme perception.
  • Found that increased stimulus variability in voice or phonetic cues significantly increased orthogonal interference.
  • Identified a parallel-contingent relationship between talker normalization and auditory-to-phonetic coding.

Conclusions:

  • Voice processing is qualitatively different from segmental phonetic information encoding, yet they are interdependent.
  • The findings support a model where talker normalization processes interact with phonetic coding.
  • Results have implications for refining current theories of speech perception and auditory processing.