Accession Number : AD0438485


Title :   ELECTROENCEPHALOGRAPHIC CHANGES IN HUMAN SUBJECTS DURING BLACKOUT PRODUCED BY POSITIVE ACCELERATION,


Corporate Author : NAVAL AIR DEVELOPMENT CENTER JOHNSVILLE PA AVIATION MEDICAL ACCELERATION LAB


Personal Author(s) : Squires,Russell D ; Jensen,R E ; Sipple,W C ; Gordon,J J


Report Date : 06 Apr 1964


Pagination or Media Count : 22


Abstract : Each of 13 human subjects was subjected alternately to a set of peak accelerations of 6 and 7 G on two separate occasions. Peak G was attained in approximately 30 seconds after the initiation of a symmetrical, sinusoidal acceleration profile. The best index of the level of consciousness appears to be the inverse relationship between the depth of blackout and the amplitude of EEG frequencies in the range of 5 cps. The lower delta frequencies were not used since artifacts due to electrode displacement resulting from head movement were seen most frequently in this range of frequencies. Moreover, the 5 to 7 cps. frequency band is associated with cerebral hypoxia which occurs during positive acceleration. This frequency band was also shown to be related to performance of specific performance tasks. (Author)


Descriptors :   *ACCELERATION TOLERANCE , BLACKOUT(PHYSIOLOGY) , ELECTROENCEPHALOGRAPHY , BRAIN , HYPOXIA , AVIATION MEDICINE , BLOOD PRESSURE , PERFORMANCE(HUMAN) , BANDPASS FILTERS , FREQUENCY ANALYZERS


Distribution Statement : APPROVED FOR PUBLIC RELEASE