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Related Experiment Video

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Amplitude envelope onset characteristics modulate phase locking for speech auditory-motor synchronization.

Min Zhu¹, Fei Chen², Chenxin Shi¹

¹School of Foreign Languages, Hunan University, Changsha, China.

Psychonomic Bulletin & Review

|January 16, 2024

Summary

Speech auditory-motor coupling strength, measured by the spontaneous speech-to-speech synchronization (SSS) test, is influenced by syllable onset consistency. Temporally consistent speech signals enhance synchronization in high synchronizers.

Keywords:

Amplitude rise time Phase-locking value Speech auditory-motor synchronization Stimulus onset

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Area of Science:

Neuroscience
Speech Science
Auditory Perception

Background:

The spontaneous speech-to-speech synchronization (SSS) test estimates cortical speech auditory-motor coupling strength using phase-locking value (PLV).
Variations in the amplitude envelope's onset of auditory speech signals may impact speech auditory-motor synchronization.

Purpose of the Study:

To investigate how amplitude envelope onset variations influence speech auditory-motor synchronization.
To compare phase-locking values (PLVs) across different syllable onset consistency conditions.

Main Methods:

Sixty Mandarin-speaking adults participated in the SSS test.
Participants listened to syllables at increasing speeds while whispering in synchrony.
Onset consistency was manipulated (aspirated, unaspirated, mixed) to assess PLVs.

Main Results:

Syllable rise time significantly affected speech auditory-motor synchronization.
High synchronizers showed higher PLVs in consistent (aspirated/unaspirated) conditions versus mixed conditions.
Low synchronizers were largely unaffected by onset consistency variations.

Conclusions:

Syllable onset consistency modulates the strength of speech auditory-motor coupling.
The SSS test can reveal individual differences in speech perception-production integration.
Findings have implications for speech and language disorders affecting speech onset processing.