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Investigating potential interactions between envelope following responses elicited simultaneously by different vowel
Vijayalakshmi Easwar1, Susan Scollie2, David Purcell2
1Department of Communication Sciences and Disorders & Waisman Center, University of Wisconsin-Madison, USA; National Centre for Audiology, Western University, Canada.
Hearing Research
|June 10, 2019
Summary
Simultaneous recording of two envelope following responses (EFRs) from different vowel formants improves time efficiency without compromising accuracy. This method enhances frequency specificity in auditory testing.
Area of Science:
- Auditory Neuroscience
- Speech Perception
- Psychoacoustics
Background:
- Envelope following responses (EFRs) reflect auditory system's tracking of voice fundamental frequency (f0).
- Improving frequency specificity of EFRs is crucial for detailed auditory analysis.
- Altering f0 in specific formants offers a method for frequency-specific EFRs, but potential interactions need investigation.
Purpose of the Study:
- To evaluate amplitude changes and accuracy of simultaneous EFR recordings from different formants.
- To assess the efficiency gains of simultaneous EFR measurements compared to individual recordings.
- To determine if simultaneous EFRs lead to significant interactions affecting amplitude or detection.
Main Methods:
- EFRs were elicited from first (F1) and second/higher (F2+) formants of vowels /u/, /a/, /i/ in 22 young adults.
- Stimuli included independent F1/F2+ presentation, simultaneous F1+F2+ presentation, and noise-masked conditions.
- Repeated-measures ANOVA analyzed EFR amplitudes, noise levels, and detection accuracy across conditions.
Main Results:
- No significant group differences in EFR amplitudes were found between individual and simultaneous (dual) conditions.
- Between-participant variability in amplitude changes was observed, particularly for /u/ F1.
- Simultaneous recording did not significantly impact EFR detection accuracy or lead to substantial amplitude reductions, suggesting minimal negative interactions.
Conclusions:
- Simultaneously recording two vowel-evoked EFRs from distinct formants is a viable method for enhancing frequency specificity.
- This approach offers improved time efficiency without compromising the accuracy of EFR measurements.
- Potential interactions between simultaneous EFRs are minimal and do not hinder the anticipated efficiency gains.
Keywords:
Frequency following responseFrequency specificityFundamental frequencyNeural phase-lockingPeriodicityPlace specificityMore Related Videos
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