Abstract
4 experiments are reported concerning the effect of the interaction of environmental, intermediate, and personal determinants on the making of size judgments of distant squares. Iu the first experiment, squares with meaningful content were perceived significantly larger than squares containing a nonsense figure, a circle, or a blank surface. The second experiment showed that the effect of meaningful stimulus content was a function of the type of experimental instructions. In the third experiment, subjects chosen as extroverts or experimentally frustrated made judgments closer to constancy than controls. The fourth experiment investigated the interactions between frustration, type of instruction, and meaningful stimulus content. 17 references. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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