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The Effect of Helmet Form on Hearing: Speech Intelligibility and Sound Localization
HUMAN ENGINEERING LAB ABERDEEN PROVING GROUND MD
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RD H. HEL-TN-10-72helmets, hearing, speech recognition, helmets, intelligibility, audiometry, army personnel, human factors engineering, army researchintelligibility, speech recognition The report presents the results of an investigation of the effects of a standard and of an experimental helmet on speech intelligibility and sound localization. Eight enlisted men with no hearing deficits were used as subjects. Intelligibility was tested with the American Standard Method for Measurement of Monosyllabic Word Intelligibility. Localization error was determined for three groups of noise bands one octave wide with center frequencies of 250, 2000 and 8000 Hz. There were no practical differences between the two helmets, nor between the bareheaded and helmeted conditions with either helmet.
APPROVED FOR PUBLIC RELEASE