Journal article
Technical Advances Toward an Endoscopic-Phototransducer Approach to Investigation of Velopharyngeal Physiology
Journal of speech, language, and hearing research, Vol.57(6), pp.2152-2161
12/01/2014
DOI: 10.1044/2014_JSLHR-S-14-0027
PMID: 25178486
Abstract
Purpose: This study aimed to examine the response characteristics of a new generation phototransducer and to test new recording and processing procedures when used with endoscopy to track velopharyngeal closure during normal speech.
Method: Integrated phototransducer-endoscopy response linearity was laboratory tested using a wide range of simulated velopharyngeal orifice areas. In vivo speech testing was completed to determine the effect of endoscope to light receptor distance on measurements documenting variations in normal velopharyngeal closure.
Results: Phototransducer response linearity was excellent (r = .99) provided an indirect (reflected light) orientation was used between the endoscope and the light-sensing fiber coupled with the phototransducer. Phototransducer response time exceeded expected velopharyngeal movement rates by an order of magnitude. In vivo speech measurements were affected by the distance between the light-emitting endoscope and the light-receiving tip of the light-sensing fiber. Data normalization to a light-out condition effectively controlled for this expected phenomenon. Patterns of velopharyngeal valving during speech were found to be stable and appropriate given the phonetic content of the utterance.
Conclusions: Technological and data-processing advances support further exploration of an integrated phototransducer-endoscopic approach to studying velopharyngeal closure for speech. Additional studies involving normal speakers are under way.
Details
- Title: Subtitle
- Technical Advances Toward an Endoscopic-Phototransducer Approach to Investigation of Velopharyngeal Physiology
- Creators
- Michael Karnell - University of IowaJerald Moon - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Journal of speech, language, and hearing research, Vol.57(6), pp.2152-2161
- DOI
- 10.1044/2014_JSLHR-S-14-0027
- PMID
- 25178486
- NLM abbreviation
- J Speech Lang Hear Res
- ISSN
- 1092-4388
- eISSN
- 1558-9102
- Publisher
- Amer Speech-Language-Hearing Assoc
- Number of pages
- 10
- Grant note
- University of Iowa Foundation Hughlett L. Morris Research Fund
- Language
- English
- Date published
- 12/01/2014
- Academic Unit
- Communication Sciences and Disorders; Craniofacial Anomalies Research Center; Otolaryngology
- Record Identifier
- 9985035879002771
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