B. F. Skinner, a prominent behaviorist, theorized that personality is not a fixed trait established in childhood but rather a collection of learned behaviors that develops continuously throughout life. He argued that what we perceive as personality is the result of 'response tendencies'—consistent patterns of behavior that are shaped and maintained by environmental reinforcements and consequences. According to Skinner, as an individual's environment and its system of rewards and punishments change, so too can their behavior and, consequently, their personality.