Two experiments on absolute judgment of visual size were carried out with variations in stimulus range of size, exposure duration, and contrast. The results indicate that the effects of all three variables are interchangeable within limited values of each, in the sense that their effects are simply additive. Thus they can be considered to form a common class of energic variable within limited conditions. Stimulus range has an additional effect over and above these mutual effects, however, in a manner which suggests that it influences judgmental factors as well as receptor factors in absolute judgment.
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