Subjective contours exist not in the distal stimulus but only in the subjective experience. Closure makes you see incomplete figures as complete and supplies the missing edges beyond gaps and barriers. Principles of Perceptual Grouping. Identification and recognition attach meaning to percepts. Contexts and Expectations.
Perceptual set is a readiness to detect a particular stimulus in a given context.
Set is temporary readiness to perceive or react to a stimulus in a particular way.