This document discusses behaviorism and some of its major theorists such as Ivan Pavlov, Edward Thorndike, John Watson, and B.F. Skinner. It explains that behaviorism views learning as occurring through conditioning in response to environmental stimuli without consideration of mental processes. It provides overviews of Pavlov's classical conditioning experiments with dogs and Skinner's operant conditioning research using positive and negative reinforcement with rats. The document also notes some limitations of the behaviorist approach in not accounting for genetics or considering humans as more than machines.