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Dialectical effects on nasalance: a multicenter, cross-continental study.

Shaheen N Awan, Tim Bressmann, Bruce Poburka

Journal of Speech, Language, and Hearing Research : JSLHR

|September 27, 2014

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North American English dialects significantly impact nasalance measures, with regional speech patterns influencing acoustic characteristics. The Texas South dialect showed the highest nasalance across tested passages.

Area of Science:

Speech-Language Pathology
Linguistics
Acoustic Phonetics

Background:

Nasalance, a measure of oral vs. nasal sound energy, is crucial for assessing velopharyngeal function.
Regional dialects of North American English exhibit distinct phonetic and phonological features.
Understanding dialectal variations is essential for accurate speech production analysis.

Purpose of the Study:

To investigate the influence of North American English dialects on nasalance.
To determine if dialectal sound changes significantly affect nasalance measures obtained from the Nasometer.
To establish dialect-specific normative data for nasalance.

Main Methods:

Collected speech samples from 300 young adult speakers across six North American dialect regions.

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Utilized recent versions of the Nasometer for instrumental nasalance measurement.

Recorded three passage types: Zoo Passage, Rainbow Passage, and Nasal Sentences.

Main Results:

Dialect explained a moderate 7%-9% of the variation in nasalance across all passages.
Significant nasalance differences were observed between speakers from geographically distinct regions.
Speakers from the Texas South dialect region exhibited the highest nasalance values.

Conclusions:

Dialectal and socially acquired speech patterns can influence acoustic speech characteristics.
Awareness of dialectal variations is crucial for interpreting nasalance data accurately.
Clinicians and researchers must consider dialect when assessing speech production and applying normative data.