The document discusses perception and the perception process. It defines perception as how individuals organize and interpret sensory impressions to make meaning of their environment. It then presents a model of the perception process, which includes receiving stimuli, selecting stimuli based on various external and internal factors, organizing the selected information, interpreting the organized information by assigning meaning, checking the interpretation, and reacting. Some of the key external factors that influence selection include intensity, size, contrast, repetition, motion, and novelty. Internal factors include learning, psychological needs, interests, and expectations. The document provides examples for many of these concepts.