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Memorization-Based Training and Testing Paradigm for Robust Vocal Identity Recognition in Expressive Speech Using
1Institute of Linguistics, Shanghai International Studies University.
Journal of Visualized Experiments : Jove
|August 26, 2024
Summary
Listeners can distinguish familiar speakers even in expressive speech. This study used electroencephalography (EEG) to show brain activity patterns, specifically the late positive component (LPC), differentiate known from unknown voices.
Area of Science:
- Cognitive Neuroscience
- Auditory Perception
- Speech Processing
Background:
- Speaker recognition is crucial for communication, but how it functions with expressive speech is not fully understood.
- Existing methods for studying speaker recognition are limited by reaction times and accuracy.
- Electroencephalography (EEG) offers a real-time measure of cognitive processes during speaker identification.
Purpose of the Study:
- To investigate how listeners recognize familiar speakers versus unfamiliar ones in expressive speech.
- To develop and validate a memorization-based speaker recognition approach using EEG.
- To analyze brain activity patterns associated with distinguishing between known and unknown voices.
Main Methods:
- A three-step paradigm: voice-name association (training), voice-name matching (checking), and old/new speaker discrimination (testing).
- Testing involved confident and doubtful speech prosody.
- EEG data were collected using a 64-channel system and analyzed using ERP and statistical methods in RStudio and MATLAB for brain topography.
Main Results:
- An enlarged late positive component (LPC) in EEG was observed for familiar (old) speakers compared to unfamiliar (new) speakers (400-850 ms).
- The old/new effect was more pronounced in central and posterior electrodes for doubtful prosody.
- For confident prosody, the old/new effect was evident across anterior, central, and posterior electrodes.
Conclusions:
- The study demonstrates a reliable EEG-based method for real-time speaker recognition.
- Findings suggest distinct neural processing for familiar versus unfamiliar voices, influenced by speech prosody.
- The experimental design can serve as a reference for studying speaker-specific cue-binding and related disorders like phonagnosia.
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