FOVEAL acuity while one is viewing a moving object has received curiously little attention. In fact, the only reference to this subject which I have been able to find is a note by Langmuir1in which, in an effort to estimate the speed of a deer botfly, he whirled above his head a piece of solder fastened to a string and noted at what speed the piece of solder appeared blurred. I have discussed this problem.2 There have been investigations of the minimum velocity perceptible as movement3and the way in which this minimum velocity varies from center to periphery of the field.4There have also been investigations of the minimum length of path which permits motion to be perceptible.5Some have claimed6that there is visual anesthesia while the eyes are voluntarily moving. Bethe's Handbuch,7Duke-Elder,8Troland9and
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Elek Ludvigh (1949) studied this question.