Person is demonstrating the concept of a perceptual set.
Perceptual set is the propensity to notice or perceive particular components of the sensory data that is available while ignoring others. Vernon asserts that the 1955 perceptual set operates in two ways:
(1) The perceiver pays attention to specific facets of the sensory data and has certain expectations: He refers to this as a selector.
(2) The perceiver understands how to categorize, comprehend, and name certain facts as well as what conclusions can be drawn from it. She refers to this as a "Interpreter."
Perceptual set theory emphasises the idea that perception is an active process involving selection, inference, and interpretation (known as top-down processing).
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