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The Relationship Between Voice Parameters and Speech Intelligibility: A Scoping Review
1Voice Research Laboratory, Faculty of Education, The University of Hong Kong, Pok Fu Lam, Hong Kong.
Summary
This scoping review found inconsistent evidence linking voice parameters to speech intelligibility. Future research needs standardized methods and diverse populations to clarify these complex relationships.
Area of Science:
- Speech and Hearing Sciences
- Communication Disorders
- Linguistics
Background:
- Understanding the link between voice characteristics and speech intelligibility is crucial for diagnosing and treating communication impairments.
- Existing research presents a heterogeneous body of evidence regarding this relationship.
- A comprehensive synthesis is needed to identify gaps and guide future research.
Purpose of the Study:
- To systematically review and synthesize the evidence on the relationship between various voice parameters and speech intelligibility.
- To identify methodological strengths and weaknesses in existing studies.
- To provide recommendations for future research in this area.
Main Methods:
- A systematic scoping review was conducted following PRISMA-ScR guidelines, searching 13 databases and performing manual searches.
- Included studies analyzed perceptual, acoustic, and aerodynamic voice parameters in relation to speech intelligibility.
- Methodological quality and evidence quality (using GRADE) were assessed, alongside a narrative synthesis of findings.
Main Results:
- Thirty studies were included, with methodological quality scores averaging 16.93/34.
- Perceptual, acoustic, and aerodynamic parameters showed inconsistent or inconclusive relationships with speech intelligibility.
- Evidence quality ranged from low to moderate, with significant heterogeneity in results and a predominance of English-language studies with non-speech-language pathologist listeners.
Conclusions:
- The relationship between voice parameters and speech intelligibility is complex and characterized by significant heterogeneity.
- Future research should prioritize standardized reporting of effect sizes, tool validity, and reliability, alongside diverse participant demographics and linguistic contexts.
- Consideration of age-related voice changes and the validation status of assessment tools is essential for improving research validity and comparability.
Keywords:
Acoustic analysisAerodynamic voice parametersMethodological qualityPerceptual voice qualitySpeech intelligibilityVoice parametersMore Related Videos
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