Abstract
A synthetic-work approach was employed in an investigation of the effects of 90-dB continuous and periodic 96-dB intermittent broad-band noise on human performance. Ten Navy and Air Force ROTC cadets worked the tasks of a multiple-task performance battery (MTPB) 12 h a week (in three, 4-h sessions) during a 4-week training period. Subsequently, they were required to work 4 days, 8 h per day on a split-shift schedule during the presence of noise, and finally, work 2 additional days on the same split-shift schedule under quiet conditions. Mean percentage of baseline performance (a composite index of performance) was enhanced by a periodic 96-dB intermittent noise, and the extent of the effect varied as a function of the number of tasks concurrently performed in the work situation. On the other hand, 90-dB continuous noise neither enhanced nor degraded performance. [Research supported by the U. S. Army Behavior and Systems Research Laboratory, Army THEMIS Contract; and by U. S. Army Medical Research and Development Command.]
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