RELATIONSHIP BETWEEN STATIC AND DYNAMIC STEREO ACUITY
NAVAL SUBMARINE MEDICAL RESEARCH LAB GROTON CT
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The study was carried out to test the relationship between dynamic and static depth perception. Fifty observers were tested for depth perception by setting two rods equidistant from themselves when the rods were either stationary or moving at one of four speeds across their field of view. The ability measured was the same as that used in selection tests by all the Armed Forces, except that the targets were moving. Two important facts emerged. First, there is a very poor relationship between static and dynamic depth perception. What relationship there was decreased as the disparity between the two speeds being compared was increased. Second, individuals have a built-in bias causing them either to set one rod too far or too close relative to the second rod. This error increases as speed is increased or as viewing time is decreased. It is concluded that when three-dimensional tracking displays are perfected, if localization in depth of moving objects is critical, the standard stationary tests of depth perception may not be adequate. Furthermore, the selection of men for operators of external manipulators on submersibles undoubtedly should be made on the basis of a moving test where the individuals bias in stereoscopic viewing is maximized.