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Perceptual rate normalization in naturally produced rate-varied speech
1Department of Linguistics, Indiana University, Bloomington, Indiana 47405, USA. knagao@indiana.edu
The Journal of the Acoustical Society of America
|June 7, 2007
Summary
Speaking rate influences how we perceive voiced and voiceless consonants. Listeners’ category boundaries shift with speech rate, closely mirroring production patterns in natural speech.
Area of Science:
- Phonetics and Speech Science
- Psychoacoustics
- Auditory Perception
Background:
- Speech perception is influenced by speaking rate, affecting category boundaries.
- Previous research used artificial stimuli; this study uses natural speech.
- Voicing perception involves distinguishing sounds like /p/ and /b/ based on Voice Onset Time (VOT).
Purpose of the Study:
- To investigate the effect of natural speech rate variation on voicing categorization.
- To compare perceptual effects with production patterns in rate-varied speech.
- To evaluate how speech rate influences the perception of consonant categories.
Main Methods:
- Utilized naturally produced speech stimuli with varying speaking rates.
- Included stimuli where VOT values for /p/ and /b/ overlapped at faster rates.
- Employed consonant identification and 'goodness' judgment tasks with listeners.
Main Results:
- Perceptual boundary shifts closely matched production rate effects.
- A slight miscategorization of voiced stops as voiceless occurred at fast rates.
- Listeners' judgments of 'best' consonant exemplars shifted away from the /p/-/b/ boundary with rate variation.
Conclusions:
- Speech rate significantly impacts voicing perception in natural speech.
- Perceptual adjustments align with production changes, with minor discrepancies.
- Findings inform exemplar-based and abstractionist models of speech perception.
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