The behaviorist perspective states that human behavior is learned through conditioning and environmental influences, not innate. It focuses on observable and measurable behaviors and their causes. Major theorists included Pavlov, Thorndike, Watson, and Skinner. Pavlov studied classical conditioning, Thorndike proposed laws of learning, Watson conducted early human experiments, and Skinner developed operant conditioning based on reinforcement and punishment. Neobehaviorism incorporated cognitive elements, exemplified by Tolman's cognitive maps and goal-directed behavior and Bandura's social learning theory, which posited that people learn through observation and modeling.