Detection of speaking with a new respiratory inductive plethysmography system

Wilhelm, Frank H. and Handke, Eva M. and Roth, Walton T.. (2003) Detection of speaking with a new respiratory inductive plethysmography system. Biomedical Sciences Instrumentation, 39. pp. 136-141.

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The LifeShirt system, a garment with integrated sensors connected to a handheld computer, allows recording of a wide variety of clinically important cardiorespiratory data continuously for extended periods outside the laboratory or clinic. The device includes sensors for assessment of physical activity and posture since both can affect physiological activation and need to be controlled. Speaking is another potential confounding factor in the interpretation of physiological data. Auditory speech recording is problematic because it can pick up sources other than the person's voice (external microphone) or is obtrusive (throat microphone). The abdominal and thoracic calibrated respiratory inductive plethysmography (RIP) sensors integrated in the LifeShirt system might be an adequate alternative for detecting speech. In a laboratory experiment we determined respiratory parameters indicative of speech. Eighteen subjects were instructed to sit quietly, write, and speak continuously, for 4 min each. Nine parameters were derived from the RIP signals and averaged over each minute. In addition, nine variability parameters were computed as their coefficients of breath-by-breath variation. Inspiratory/expiratory time (IE-ratio) best distinguished speaking from writing with 98% correct classification at a cutoff criterion of 0.52. This criterion was equally successful in distinguishing speaking from sitting quietly. Discriminant analyses indicated that linear combinations of IE-ratio and a variety of other parameters did not reliably improve classification accuracy across tasks and replications. These results demonstrate the high efficacy of RIP-derived IE-ratio for speech detection and suggest that auditory recording is not necessary for detection of speech in ambulatory assessment.
Faculties and Departments:07 Faculty of Psychology
07 Faculty of Psychology > Departement Psychologie > Ehemalige Einheiten Psychologie > Abteilung Klinische Psychologie und Psychiatrie
07 Faculty of Psychology > Departement Psychologie > Ehemalige Einheiten Psychologie > Psychophysiologie (Wilhelm)
UniBasel Contributors:Wilhelm, Frank H
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Instrument Society of America
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:28 Sep 2017 15:18
Deposited On:22 Mar 2012 13:49

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