This document discusses the key concepts of perception. It begins by defining perception as the process of interpreting our senses to provide order and meaning to the environment. It then outlines the main components and subprocesses of perception, including the perceiver, target, and situation. The document also examines perceptual selectivity and the external and internal factors that influence what we pay attention to. Finally, it explores perceptual organization and how principles like proximity, similarity, closure, and continuity help us organize sensory information. The overall document provides a comprehensive overview of the main elements involved in the cognitive process of perception.