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Spastic/spasmodic vs. tremulous vocal quality: motor speech profile analysis
Donna S Lundy1, Soham Roy, Jun W Xue
1Department of Otolaryngology, University of Miami, School of Medicine, Miami, Florida 33101, USA. dlundy@med.miami.edu
Summary
Acoustic analysis can differentiate strained, strangled, and tremulous voice qualities in adductor spasmodic dysphonia (ADSD), voice tremor (Tremor), and amyotrophic lateral sclerosis (ALS) spastic dysarthria. Motor speech parameters reveal distinct profiles for each neurologic condition.
Area of Science:
- Neurology
- Speech-Language Pathology
- Acoustic Analysis
Background:
- Strained, strangled, and tremulous vocal qualities can present similarly across different neurologic conditions.
- Differentiating conditions like adductor spasmodic dysphonia (ADSD), voice tremor (Tremor), and amyotrophic lateral sclerosis (ALS) spastic dysarthria is clinically important.
Purpose of the Study:
- To investigate if acoustic and motor speech parameters can differentiate vocal qualities in ADSD, Tremor, and ALS.
- To identify specific features that distinguish these neurologic voice disorders.
Main Methods:
- Analysis of three subject groups: ADSD, Tremor, and ALS.
- Utilized the Motor Speech Profile System for acoustic and motor speech parameter assessment.
- Measured fundamental frequency (Fo), Fo variability, diadochokinetic rate (ddk), ddk variability, mean intensity, intensity variability, and speaking rate.
Main Results:
- Distinct acoustic and motor speech profiles were identified for ADSD, Tremor, and ALS groups.
- Specific parameters showed significant differences between the conditions, aiding in differentiation.
Conclusions:
- Acoustic and motor speech analysis is effective in differentiating ADSD, voice tremor, and ALS-related spastic dysarthria.
- The Motor Speech Profile System provides valuable data for distinguishing these neurologic voice conditions.