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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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A role for amplitude modulation phase relationships in speech rhythm perception.

Victoria Leong1, Michael A Stone2, Richard E Turner3

  • 1Centre for Neuroscience in Education, Department of Psychology, University of Cambridge, Downing Street, Cambridge CB2 3EB, United Kingdom.

The Journal of the Acoustical Society of America
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The phase relationship between stress and syllable amplitude modulation (AM) rates is crucial for perceiving speech rhythm. Shifting this phase alters listeners' perception of rhythmic patterns in speech.

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Area of Science:

  • Speech Perception
  • Auditory Neuroscience
  • Psychoacoustics

Background:

  • Prosodic rhythm in speech relies on amplitude modulation (AM) within the speech envelope.
  • The specific AM rates and statistics critical for rhythm perception remain unclear.

Purpose of the Study:

  • To test the hypothesis that the phase relationship between "Stress" rate (∼2 Hz) and "Syllable" rate (∼4 Hz) AMs cues speech rhythm.
  • To investigate how manipulating this phase relationship affects listeners' rhythm judgments.

Main Methods:

  • Adult listeners performed a rhythm judgment task on AM tone-vocoded nursery rhymes.
  • The phase relationship between Stress AM and Syllable AM was parametrically shifted.
  • A control condition examined phase-shifts between Syllable AM and Sub-beat AM (∼14 Hz).

Main Results:

  • Listeners' rhythm perception systematically shifted with changes in the Stress-Syllable AM phase relationship.
  • A 1π radian phase-shift reversed perceived rhythm (trochaic to iambic), while a 2π shift retained it.
  • Phase-shifts involving the Sub-beat AM did not affect rhythm perception.

Conclusions:

  • The phase relationship between Stress and Syllable AM is a key envelope-based statistic for speech rhythm perception.
  • This finding highlights the importance of specific modulation statistics in auditory processing for speech.