Visual recovery of test target detectability following local adaptation to glare flash in the peripheral visual field (0, 20, and 40°) was investigated using visual latency as a measure. The results showed that (1) visual latency increased as a function of increasing flash luminance as well as duration of the adapting flash, and that (2) peripheral latency was found to be longer than that of foveal one. The results were discussed in terms of major problem on traffic safety.
The effects of an aural display in a compensatory tracking task are studied as compared with a visual display. The aural display system consists of a stereoheadphone and a FM-convertor, which indicates the magnitude of tracking error with the tone pitch and the polarity by switching the tone between the left and the right earphone. The root-mean-squres and the describing functions of the input and the tracking error are measured in different conditions. In this measurement, a simple fourier analysis technique is applied using an analog-computer. As the results of this paper, an evaluation of human operator control characteristics for aural compensatory tracking tasks is presented.