The Visual Evoked Cortical Response as a Measure of Stress in Naval Environments: Methodology and Analysis. (1) Slow Flash Rates

摘要

The emphasis in this report is upon methodology for use in evaluating the visual evoked response (VER), since our primary interest is in using it as a tool in the study of Naval problems. In order to employ the VER to full advantage, techniques have to be evolved to assess the significance of differences among evoked responses; two such methods are assessed in this paper. One of these, a determination of a mean VER, is effective in evaluating the statistical significance of subtle differences among evoked responses. The second technique is designed to isolate differences in underlying processes in the VER by summating responses to one stimulus and subtracting the same number of responses to another. In the course of these investigations, we have found an element in the VER strongly responsive to patterned stimuli and small differences among VER's attributable to hue. The latter are in excellent agreement with psychophysical data on the color response of normal and color defective subjects. (Author)