◆ SpookStack

- 300020001-6 Approved For Release OPRAH | GI RDPIG 00788R001 ST—CS-01-169-72 July 1972 the Communist Chinese in the Korean War and the Confederate "yell" of the Civil War. Annoyance sounds would be sounds used to interfere with work performance such as the ability to learn and retain. Gross psychological damage would be the complete loss of the ability to function, destroying or "muddling" of the conscious to such a degree that the ability of all but involuntary actions (breathing, heart beat) would be destroyed. Vogel states that nowhere in the scientific literature could there be found a documented incident where high intensity sound caused a gross psychological effect, or any closely related effect, on a man. 6. (U) The intense noises associated with aircarft may in many ways be similar to those that might be purposely generated under combat conditions. In this respect, the work of Terent'yev, Sheludyakov and Sviridova (271) may be quite relevant to assessment of the psycho- logical effects of noise on highly motivated, trained personnel. These investigators observed 90 people from an aviation engineering techni- cal staff, who, in the course of their work, were subjected to the influence of noise with an intensity of 100-102, 110-112, 118-120, and 130-136 db daily, or two to three times a week for one to six hours at a time. The majority of the technicians exposed to 130 db and more, complained of general fatigue, reduced work capability, headache, unpleasant sensations in the region of the heart, noise and ringing in the ears after each day's work, less frequently of itching over the entire body, pains in the front wall of the abdomen, and sometimes nausea and vomiting. In some, sleep was irregular and appetite lowered. In a majority, these phenomena disappeared after a nights sleep; in others after 2-3 days if work under noise condi- tions was not repeated. Analysis of case data showed that the frequency, expression and duration of unfavorable sensations were determined by both intensity and noise duration. Individual charac-~ teristics of those examined were also important. The symptom complexes described developed more frequently and earlier in people in whom head trauma, hyperthyroid, neurocirculatory dystony and other illnesses had been noted. In order to validate the observations made under work noise conditions, fifteen healthy volwmteers were tested under laboratory conditions. After exposure to noise with an intensity of 100-102 db for one hour, some subjects complained of noise in the head and sleepiness; after three hours, five of eleven complained of general fatigue and one, of sleepiness; after six hours, all examinees complained of noise and ringing in the ears, headache and general fatigue, reduced appetite, nausea, sleepiness and general irritability. After exposure to an intensity of 110-112 db for up to three hours, all subjects complained of headache, fatigue, sleepiness, and a sensation of deposits in the ears; one subject complained of nausea and reduction of work capability. 95 UNCLASSIFIED Approved For Release 2003/09/10 : CIA-RDP96-00788R001300020001-6