The document discusses the concepts of sensation and perception. It defines sensation as the process of sensing our environment through our five senses, while perception is how we interpret these sensations to make sense of our surroundings. The key processes involved in perception are sensation, where sensory stimuli are received; perceptual organization, where internal representations are formed; and identification and recognition, where meaning is assigned to objects perceived. Several factors influence perception, including personal experiences, socio-cultural influences, and laws of organization that govern how we group similar objects and complete patterns. Sensation and perception are critical for how humans understand the world.