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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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Evidence for precategorical extrinsic vowel normalization.

Matthias J Sjerps¹, James M McQueen, Holger Mitterer

¹Max Planck Institute for Psycholinguistics, Wundtlaan 1, 6525 XD Nijmegen, The Netherlands. matthias.sjerps@mpi.nl

Attention, Perception & Psychophysics

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Summary

This summary is machine-generated.

Extrinsic vowel normalization, a process influencing vowel perception, occurs at a precategorical processing level. This finding was supported by categorization and discrimination tasks examining vowel sounds.

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Area of Science:

Phonetics
Auditory Perception
Psychoacoustics

Background:

Vowel normalization adjusts vowel perception based on surrounding speech sounds.
Understanding the processing level (categorical vs. precategorical) of vowel normalization is crucial for speech perception models.

Purpose of the Study:

To investigate whether extrinsic vowel normalization occurs at a categorical or precategorical processing level.
To differentiate the roles of categorization and precategorical perception in vowel normalization.

Main Methods:

Three experiments using categorization and discrimination tasks.
Manipulation of the first formant (F(1)) in auditory contexts to elicit vowel normalization.
Use of an [I]-[ε] vowel continuum and controlled syllable contexts.

Main Results:

Vowel normalization effects were replicated in categorization tasks.
Vowel normalization was also observed in a precategorical discrimination task.
Discrimination patterns in Experiment 3 showed contextual influences but lacked predicted categorization peaks.

Conclusions:

Extrinsic vowel normalization is a process that occurs, at least in part, at a precategorical processing level.
The findings challenge purely categorical accounts of vowel normalization and highlight precategorical contributions.