Psychophysical Evaluation of Acoustic Navigation Aids: Preference and Aversiveness.
NATIONAL BUREAU OF STANDARDS GAITHERSBURG MD
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Ten college students gave preference judgments for four pure tones 120, 300, 500, and 835 Hz and 11 tone composites constructed from combinations of the pure tones. The method of paired comparisons was used to compute the mean percent preferred for each stimulus and to construct a Thurstonian scale of preference. Equal aversion levels were also measured for the four pure tones and for five of the composites. In the aversiveness portion the same subjects pressed rapidly on a telegraph key to produce decrements in sound intensity on an FR 10 DRH 0.2 s schedule. If they failed to press, the intensity gradually increased. Asymptotic sound pressure levels maintained by the group after 7 min of responding were interpreted as equal tolerance limits for the stimuli. They were converted into sensation level measures to take into account the differential audibility of the signals. Certain operational conclusions were suggested for the design of acoustic navigation aids. Author Modified Abstract
- Anatomy and Physiology
- Human Factors Engineering and Man Machine Systems