Accession Number : ADP006100

Title :   Detection of Acceleration (+Gz) Induced Blackout by Matched-Filtering of Visual Evoked Potentials,

Corporate Author : NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA

Personal Author(s) : Nelson, John G. ; Cammarota, Joseph P. ; Hrebien, Leonid

Report Date : FEB 1988

Pagination or Media Count : 13

Abstract : In air-combat-maneuvering and on human centrifuges, moderate levels of positive acceleration (+Gz), coupled with moderate rates of onset, produce visual symptoms which are ordinarily progressive: Decreasing visual sensitivity, dimming of the visual field, peripheral light-loss, and central light-loss (black-out). Since these symptoms provide commonly used tolerance end point in acceleration research. In order to provide an objective indication of the integrity of the visual system, we have developed a method for real-time monitoring of the steady-state visual evoked potential (VEP). Since significant degradation of visual functioning must be recognized in approximately three seconds, we required a previously unattained efficiency in producing and measuring the VEP. Using the Fast Fourier Transform (FFT), we developed a noise matched filter, with evaluation only at the expected response peak. (js)

Descriptors :   *BRAIN, CENTRIFUGES, DEGRADATION, DETECTION, FAST FOURIER TRANSFORMS, HUMANS, MATCHED FILTERS, MONITORING, NOISE, PEAK VALUES, REAL TIME, RESPONSE, SENSITIVITY, SIGNS AND SYMPTOMS, TOLERANCE, VISION, VISUAL PERCEPTION.

Subject Categories : Psychology
      Medicine and Medical Research

Distribution Statement : APPROVED FOR PUBLIC RELEASE