Abstract
The studies reported in this paper are classified into four general areas: (a) studies of size judgment; (b) studies of the relationships between physiological needs and perception; (c) studies on "selective sensitiza-tion" to positively valued stimuli; and (d) studies concerned with "perceptual defense." A section is also included on the various ways of defining the term perception. The author concludes that a need exists for further research, replication of existing studies, improved methodology, and a greater concern for theoretical objectives. One-hundred twenty-nine-item bibliography.

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