◆ SpookStack

Approved For Release 284/69 1da-RDP96-00788R001300020001-6 ST-CS-01-169-72 July 1972 In the third chapter results of studies are compared with data from references. This book is recommended for neuropathologiste, otolaryngologists, therapeutists and pathomorphologists. TABLE OF CONTENTS: (abridged) Foreword -—- 3 Introduction -—- 5 Harmful effects of sounds and noises on the organism -- 8 Producing attacks caused by sound. -— 70 Morphological principles of functional changes in the central nervous system caused by sound ~~ 112 Bibliography -- 138 references SECTION II - INFRASONIC NOISE 1. (UV) The following discussion. on the effects of infrasound is based on a report by Maire (257). Due to the lack of appropriate Soviet literature, this discussion is based upon references from other countries, 2. (U) Observed psychological and physiological effects have included significant impairment of compensatory tracking ability, choice~reaction time, foot pressure constancy and peripheral. vision. Other effects were greater arror increases in reaction times and performance at 5 Hz than at 2 Hz, increased initial reaction time and an increasingly detrimental effect on visual performance as frequencies were increased above 8 Hz, with maximum effect occuring between 40 and 50 Hz. Gavreau (258) observed that high intensity infrasound caused sensations of panic and the impression that the head would burst. Infrasound at a frequeney of 7 Hz (emitted by a faulty industrial ventilator) caused diffi- culty in the performance of mental activities and precision work. Other studies (259, 260) have shown that at exposures to stimuli of 15-17 Hz, at SPL's (sound pressure level) of approximately 104 dB, subjects experienced feelings of apprehension. During initial exposures to intense sound fields, many individuals presented symptoms typical of generalized stress reactions, particularly in cases where suffictently effective ear protectors were not in use. Severe storm activity in North America was compared with the automobile accident rate and the rate of absenteeism among school children in the area of Chicago, Illinois during May 1967. The results sugges ted that a correlation may exist between the presence of infrasonic disturbances in the area and changes in selected pattems of human behavior (261). 92 UNCLASSIFIED