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OBJECTIVE MEASURES OF PLOSIVE NASALIZATION IN HYPERNASAL SPEECH
Michael Saxon1, Julie Liss2, Visar Berisha1,2
1School of Electrical, Computer, and Energy Engineering, Arizona State University.
Summary
New acoustic features objectively quantify hypernasal speech in neurological disorders. This method analyzes speech sounds to provide a reliable measure, aiding diagnosis and treatment.
Area of Science:
- Speech Science
- Neurolinguistics
- Acoustic Phonetics
Background:
- Hypernasal speech is a frequent symptom in neurological disorders.
- Its variable acoustic signature complicates objective quantification.
- Existing perceptual and acoustic methods lack precision.
Purpose of the Study:
- To introduce nasal cognate distinctiveness features as an objective acoustic proxy for hypernasality.
- To develop a novel method for quantifying hypernasal speech.
- To improve the diagnostic accuracy of hypernasality in neurological conditions.
Main Methods:
- Developed features based on likelihood ratios between plosive and nasal cognates (e.g., /t/ vs. /n/).
- Utilized an acoustic model trained exclusively on healthy speech data.
- Evaluated features on 75 dysarthria patients with varying hypernasality levels.
Main Results:
- The proposed nasal cognate distinctiveness features demonstrated favorable comparison with clinical subjective evaluations.
- The features effectively captured acoustic variations associated with hypernasality.
- Objective acoustic measures correlated well with expert speech-language pathologist perceptions.
Conclusions:
- Nasal cognate distinctiveness features offer a promising objective method for quantifying hypernasal speech.
- This approach can aid in the diagnosis and management of speech disorders in neurological populations.
- Further research can refine these features for broader clinical application.
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