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Concentration of carbon dioxide in exhaled air in fluent and non-fluent speech
Barbara Raczek1, Bogdan Adamczyk
1Institute of Physics, Maria Curie-Skłodowska University, Lublin, Poland. barbracz@tytan.umcs.lublin.pl
Abstract:
The results of dynamic measurements of carbon dioxide (CO2, in %) in exhaled air during speech are presented. Fourteen stuttering persons and 14 persons with fluent speech took part in a test that involved independent speaking and echo-assisted speaking (delayed auditory feedback). A statistical comparative analysis of average levels of CO2 concentration registered during speech and resting respiration immediately before speaking indicated significant differences in non-fluent speech and insignificant differences in fluent speech. It was determined that the average concentration of CO2 in exhaled air while stuttering was 1/5 lower than the concentration of CO2 registered during fluent speaking.
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