Perceiving an old woman's face rather than a young woman's profile may depend on which of two unambiguous facial drawings was viewed first.This best illustrates the importance of

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Perceptual set refers to a mental predisposition to perceive one thing and not another. In this case, the viewer's previous exposure to a particular image may have influenced their perception and made them more likely to perceive the old woman's face rather than the young woman's profile.

Perceiving an Old Woman's Face Rather Than a Young Woman's