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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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Spectral motion contrast as a speech context effect.

Ningyuan Wang¹, Andrew J Oxenham¹

¹Department of Psychology, University of Minnesota, Minneapolis, Minnesota 55455.

The Journal of the Acoustical Society of America

|September 6, 2014

Summary

Spectral motion after-effects influence speech perception by altering how we interpret sound. This study shows spectral motion, like visual motion, impacts speech category boundaries, complementing existing spectral contrast theories.

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Area of Science:

Auditory perception
Speech processing
Psychoacoustics

Background:

Spectral contrast effects aid perceptual constancy in variable acoustic environments.
Previous research focused on long-term average power spectrum after-effects.
This study investigates contrast effects based on spectral motion.

Purpose of the Study:

To establish the existence of spectral-motion after-effects.
To determine if spectral motion influences speech category boundaries.
To examine spectral-motion after-effects with short, speech-like stimuli.

Main Methods:

Experiment 1: Assessed influence of inducer spectral glide direction on target spectral glide identification.
Experiment 2: Used synthetic sine-wave speech with formant transitions as targets.
Experiment 3: Employed synthetic sine-wave speech for both inducers and targets.

Main Results:

Spectral-motion after-effects were demonstrated with word-length inducers.
The speech category boundary shifted based on the inducer glide's presence and direction.
After-effects occurred even with brief inducers and small frequency changes.

Conclusions:

Spectral motion contributes to speech context effects.
Spectral motion plays a complementary role to the long-term average power spectrum.
These findings advance understanding of auditory scene analysis and speech perception.