SPEECH INTELLIGIBILITY DURING PROLONGED EXPOSURE TO HELIUM-OXYGEN.
NAVAL MEDICAL RESEARCH LAB NEW LONDON CONN
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Changes in the intelligibility of speech during six days of breathing a mixture of helium and oxygen were investigated. Speech was sampled before breathing the mixture, and on the second, fourth and sixth days of exposure in a chamber containing 21 oxygen and 79 helium. There was a deterioration in intelligibility on the second day which was not observable thereafter. A return to more natural speech also occurred by the fourth and sixth days. It is suggested that a talker attains a more normal quality and intelligibility to his speech after becoming accustomed to several days exposure to the helium-oxygen mixture described. Author