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Nasalance scores in noncleft individuals: why not zero?
C E Gildersleeve-Neumann1, R M Dalston
1Department of Communication Sciences and Disorders, College of Communication, University of Texas at Austin, 78712, USA.
Summary
Nasal acoustic energy, not oral, causes nasalance in normal speech. This suggests sound travels through the nose, impacting speech clarity in patients with cleft palates.
Area of Science:
- Speech-language pathology
- Acoustic phonetics
Background:
- Nasalance scores quantify nasal acoustic energy during speech.
- Nonzero nasalance in nonnasal speech suggests an atypical sound transmission pathway.
Purpose of the Study:
- To investigate the primary source of nasalance in nonnasal speech in individuals with normal speech.
- To differentiate between oral and nasal acoustic energy contributions to nasalance.
Main Methods:
- Sixty adults with normal speech produced nonnasal sentences and sustained vowels.
- Nares occlusion was employed to isolate nasal acoustic energy.
Main Results:
- Significant reduction in nasalance scores with nares occlusion across all stimuli.
- Mean nasalance decrease ranged from 8 to 25, indicating substantial nasal acoustic energy.
Conclusions:
- The majority of acoustic energy detected during nonnasal speech originates from nasal transmission.
- Transpalatal transmission may explain this phenomenon, with implications for hypernasality in cleft palate patients.
- Surgical correction of velopharyngeal function may not fully resolve hypernasality due to altered acoustic transmission.
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