Abstract
Summary.-Data were obtained on the search time required by high school senior boys to find a target in structured, abstracr displays presented at three visual noise levels. It was found that the rank ordering of performance on the three noise levels was the same for these 12 Ss as for 22 Navy pilots tested earlier. Also, rhe students had effectively the same absolute performance as the pilots. This study provided the basis for the decision to use high school senior boys in fumre laboratory experiments of rhis type when pilots were not available. Data were also obtained from the 12 Ss on four foveal-acuiry tests. The scores on three of the tests showed significant correlation with one another. Scores on the fourth test (Bausch & Lomb checkerboard) did not correlate significantly with scores from any of the other three. The increasing use of television (TV) in applications other than entertainment has created a need for methods of eval~~ating and comparing various TV systems and has produced a requirement for the development of measures of the usef~~lness of TV displays. Visual noise and information rate are two display parameters that affect the usefi~lness of a visual display and may interact to cause greater degradation of the picture than results from the sum of their independent effects. An experiment to investigate these parameters, with 22 Navy pilots as Ss, was conducted at the U.S. Naval Ordnance Test Station (NOTS), China Lake, California, in the summer of 1964. The target search and detection portion of this experiment was re
Published Version
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