This document discusses the concept of perception. It defines perception as the process by which individuals select, organize, and interpret stimuli to form a meaningful understanding of the world. Perception involves sensation, where sensory organs directly respond to stimuli, as well as perceptual selection, organization, and interpretation. Key aspects of perception discussed include absolute and differential thresholds, subliminal perception, figure-ground relationship, grouping, closure, stereotypes, physical appearances, descriptive terms, first impressions, and halo effects. Perception is shaped by individuals' experiences, motives, and biases.