Cognitive psychology: branch concerned with how people acquire, store, transform, use, and communicate information. Perception: interpreting sensory information to yield meaningful information. Pattern recognition: classifying a stimulus into a known category. Memory: storage facilities and retrieval processes of cognition. Recognition: memory process; see something as familiar. Recall: memory process; determine information from memory without aids. Reasoning: going from premises to a conclusion. Problem solving: transforming starting information into a goal state. Knowledge representation: mental depiction, storage, and organization of information. Language: system of communication governed by system of rules and can express an infinite number of propositions. Decision making: process to select one course of action among alternatives. Cognitive processes are complex and we are unaware because it occurs often rapidly, and with little effort. Uncertain how many processes take place and in what sequence. Ideas about certain mental abilities date back to at least aristotle and plato. Empiricism: role of experience to acquire knowledge.