Behaviorist theories focus on the idea that all behaviors are learned through interactions with the environment. This approach emphasizes observable actions rather than internal thoughts or feelings. Key figures in behaviorism include B.F. Skinner, who introduced concepts like reinforcement and punishment, and John B. Watson, who argued that psychology should study only observable behavior. These theories suggest that behaviors can be shaped and modified through conditioning. There are two main types of conditioning: classical conditioning, which involves associating a neutral stimulus with a significant one, and operant conditioning, which uses rewards and consequences to influence behavior.