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Related Experiment Video

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Foreign Accent and Forensic Speaker Identification in Voice Lineups: The Influence of Acoustic Features Based on Prosody
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Vowels as Islands of Reliability.

Randy L Diehl1, Keith R Kluender1, Donald J Foss1

  • 1University of Texas at Austin.

Journal of Memory and Language
|December 16, 2014
PubMed
Summary

Consonant identification relies on the preceding vowel sound. Longer vowel durations lead to slower recognition of initial consonants, indicating vowel dependence in speech perception.

Area of Science:

  • Speech Perception
  • Phonetics
  • Auditory Neuroscience

Background:

  • The perception of speech sounds involves complex integration of acoustic cues.
  • Vowel nuclei offer a stable acoustic frame, but their role in consonant identification is debated.

Purpose of the Study:

  • To investigate the dependency of initial consonant identification on the duration and acoustic properties of the following vowel nucleus.
  • To determine if the vocalic frame is essential for reliable consonant recognition.

Main Methods:

  • Listeners identified initial consonants (/b/, /d/, /g/) in /bVs/, /dVs/, /gVs/ syllables.
  • Syllables featured 10 English vowels with varying intrinsic durations.
  • Response times to consonant targets were measured and analyzed in relation to vowel duration.

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Main Results:

  • Response times to initial consonants showed a positive correlation with the duration of the following vowel.
  • This effect persisted even after controlling for consonant-vowel formant transition duration.
  • Evidence suggests a critical period of vowel evaluation is necessary for consonant identification.

Conclusions:

  • Consonant recognition is significantly dependent on the characteristics of the vowel nucleus.
  • Listeners require evaluation of a portion of the vowel formant trajectory for accurate consonant identification.
  • The findings support the 'vocalic frame' hypothesis in speech sound perception.