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Visual Search Experiment: Noise Persistence, Acuity, Response Time

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Abstract

This experiment demonstrated the degradation in search performance resulting from a decrease in the frame rate of a static, structured display containing visual noise. The display was produced by projecting moving pictures of the static, structured scene. Television-type visual noise in the scene was obtained by double exposure and special printing of the film. After a 10-sec search, the probability of detecting the target was 0.94 in the noise-free display, 0.85 in the noisy display simulating 26 frames/sec, and 0.78 in the noisy display simulating 5.2 frames/sec. These results indicate that restricted usefulness of a low-frame-rate, television-type display may be expected in a low signal-to-noise ratio condition.

Neither peripheral acuity, foveal acuity, nor eye-dominance scores correlated significantly with search time. There was a significant correlation between response time and search time, which can be attributed to the mental processing and decision time common to both tasks.

© 1966 Optical Society of America

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