HUMAN PERFORMANCE AS A FUNCTION OF CHANGES IN ACOUSTIC NOISE LEVELS
Final rept., Jun 1964-Feb 1965
AIR FORCE AEROSPACE MEDICAL RESEARCH LAB WRIGHT-PATTERSON AFB OH
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Psychomotor performance of 16 subjects was evaluated under four noise conditions, during four test sessions, in a Latin square design. Three experimental conditions each began with different intensities of noise Quiet, 85 dB, or 95 dB. After 30 minutes exposure the noise was changed to a final high intensity level 110dB, which lasted for 15 minutes. The fourth condition served as a control, in which Quiet prevailed throughout the entire 45 minute period. The results partially supported the hypothesis that greater changes in noise levels produce greater decrements in performance. There was, however, a strong interaction between noise conditions and sessions. The nature of this interaction indicated that this phenomenon does not occur uniformly throughout the course of learning, and probably is of lesser importance for well learned tasks.
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