Concentration of carbon dioxide in exhaled air in fluent and non-fluent speech.
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.
Institute of Physics, Maria Curie-Skłodowska University, Lublin, Poland. barbracz@tytan.umcs.lublin.pl
Barbara
B
Raczek
Bogdan
B
Adamczyk
D000293:Adolescent; D000328:Adult; D002245:Carbon Dioxide / Q000032:analysis*; D045853:Exhalation; D005260:Female; D006801:Humans; D001239:Inhalation; D008297:Male; D013060:Speech / Q000502:physiology*; D013342:Stuttering / Q000175:diagnosis* / Q000628:therapy*; D014705:Verbal Behavior
D002245:Carbon Dioxide