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Effect of normobaric hypoxia on sound localization
R L Martin1, D B Watson, S E Smith
1Aeronautical and Maritime Research Laboratory, Defence Science and Technology Organisation, Fishermens Bend, Victoria, Australia. Russell.Martin@dsto.defence.gov.au
Aviation, Space, and Environmental Medicine
|October 29, 2000
Summary
Hypoxia does not affect sound localization in aviation environments. This finding supports the development of 3D audio displays for pilots and aircraft systems operators.
Area of Science:
- Auditory perception
- Human factors in aviation
Background:
- Three-dimensional (3D) audio displays offer potential for spatial information in aviation.
- Hypoxia, a condition of reduced oxygen, may impact the reliability of these displays.
- Aircraft systems operators face routine exposure to mild hypoxia.
Purpose of the Study:
- To investigate the effect of hypoxia on sound localization performance.
- To determine the reliability of 3D audio displays under varying oxygen levels.
Main Methods:
- Four subjects were exposed to simulated altitudes of 0, 1200, 2400, and 3700 m.
- Sound localization was measured using free-field sources at various azimuth and elevation angles.
Main Results:
- Localization performance was statistically similar across all tested altitudes.
- Average localization errors ranged from 12.6 to 14 degrees.
Conclusions:
- Hypoxia up to 3700 m simulated altitude does not significantly affect sound localization.
- This finding is promising for the advancement of 3D audio displays in aviation.