This document discusses behaviorism, a learning theory that explains human behavior in terms of conditioning responses to environmental stimuli without reference to internal mental states. It summarizes the key contributions of several influential behaviorist psychologists including Ivan Pavlov, B.F. Skinner, John Watson, and Albert Bandura. Pavlov studied classical conditioning in dogs, Skinner researched operant conditioning through his experiments with animals, Watson promoted the idea that behaviors are learned through interaction with the environment, and Bandura focused on social learning and modeling behaviors after others. The document also provides examples of applying behaviorist principles in classroom settings through positive and negative reinforcement of student behaviors.