Arousal from Sleep by Noises from Aircraft with and Without Acoustically Treated Nacelles, Volume 2279
National Aeronautics and Space Administration, 1973 - Airplanes - 45 pages
The electroencephalographic and behavioral responses during sleep of four subjects, aged 46 to 58 years, to three types of noises were tested over 14 consecutive nights. The stimuli were two DC-8 jet landing noises (each 30 seconds in duration and coming from DC-8 aircraft with and without acoustical treatment on the engine nacelles) and a 4-second burst of pink noise. Each of the noises was tested at nominal intensities of 61 and 79 dBA. Other physical descriptors of the noises were measured or computed. The results indicate that for an equivalent degree of sleep disruption, noise form the jet aircraft with untreated nacelles must be about 6 dBA less intense than the jet with acoustically treated nacelles. Predictions of the effects of noise on sleep appear, tentatively, to attain the highest accuracy when the physical descriptor of noise intensity includes information about the impulsive characteristics of that noise as well as its long-term spectral content.
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ACOUSTIC STIMULATION aircraft noises Alpha arousal and behavioral arousal Response awake switch behavioral awakening Response burst of pink calculate control trials correlation d1ND DC-8 WITH TREATED duration EEG FREQUENCY BAND EEG Frequency Levels effects of noise electrode electroencephalograph EMG level EPNdB EPNdBTM FOUR RESPONSES FREQUENCIES TO THREE FREQUENCY BAND AMPLITUDES frequency of behavioral illustrated in Figure impulse correction intensity pink noise jet aircraft jet engine Kryter Levels in Response Lukas Max dBA Max PNdB minute just preceding monopolar NASA Report nominal intensities number of test Numbers in parentheses parentheses are percentages pink noise burst RESPONSE FREQUENCIES RESPONSES d dND RESPONSES TO ACOUSTIC SLEEP EEG FREQUENCY sleep stage Delta sleep stage REM small number Sonic Booms Standard Deviation Stanford Research Institute statistically significant STIMULATION DURING SLEEP subjects test nights Theta three sleep stages three stimuli TREATED ENGINE NACELLES treated jet noise Types of Noises untreated jet UntreateI