Abstract
This experiment was an attempt to reinstate the Osgood-Heyer (1952) model for explanatory purposes in perception, with the object of making plausible extension of that model in order to explain movement aftereffects. The experiment involved sets of double-line figures at various distances from a fixation point and Ss were unable to distinguish the two lines when sufficiently far from the fixation point, and under conditions of "fatigue." Thus, the principal features of the Osgood-Heyer model can easily be preserved from the main objections made against them by Deutsch (1956).

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