Abstract

The minimum discriminable target velocity was determined with and without reference lines in the visual field. At a short (0.125 sec) exposure duration, where velocity discrimination is determined primarily by the magnitude of initial photochemical events, the velocity threshold is not changed by the introduction of reference lines. At a long (16 sec) exposure duration, the presence of reference lines lowers the threshold velocity by 48%. The data are interpreted as supporting the hypothesis that movement is discriminated at slow speeds by observation of change of position.

© 1955 Optical Society of America

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