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Publication AbstractsEffect of Normobaric Hypoxia on Sound LocalizationRussell L. Martin, Ph.D., Dougal B. Watson, M.B.B.S., D.Av.Med., Sean E. Smith, B.A.(Hons), Ken I. McAnally, Ph.D., and David L. Emonson, M.Sc., M.B.B.S.Aviat Space Environ Med 2000; 71:991-5 AbstractBackground: Three-dimensional (3D) audio displays have considerable potential for conveying spatial information in the aviation environment. How reliably these displays will function in that environment will depend in part on the extent to which sound localization is affected by hypoxia. Many aircraft systems operators are routinely exposed to mild hypoxia, and all are at risk of exposure to more severe hypoxia. Methods: We have examined hypoxia's effect on localization by measuring the localization performance of four subjects exposed to simulated altitudes of 0, 1200, 2400 and 3700 m above sea level for about 30 min. Sounds to be localized were presented from a free-field source at locations covering 360° of azimuth and extending from -47.6 to + 80° elevation. Results: Localization performance was statistically indistinguishable across the altitudes tested. Average localization errors ranged from 12.6° ± 0.7 SE at 2400 m to 14° ± 0.84 SE at 0 m. Conclusion: The finding that hypoxia induced by exposure to simulated altitudes as high as 3700 m has no effect of sound localization is encouraging with respect to the continued development of 3D audio displays for use in the aviation environment.Keywords: hypoxia, sound localization, audio display. Information on subscribing, and on obtaining copies of an article or of an entire issue. Table of Contents for Volume 71, Number 10 of the ASME journal.
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