The behavioral orientation studies observable behavior and how it is learned. It builds on Ivan Pavlov, John B. Watson and B. F. Skinner, and it grew into behavior therapy and applied behavior analysis.

Vocabulary & evolution of terms

• Conditioning: classical conditioning (Pavlov) pairs stimuli, and operant conditioning (Skinner) links behavior to its consequences. Later learning theory added cognitive factors such as expectancy.
• Reinforcement: Skinner's term for any consequence that makes a behavior more likely, either positive (something added) or negative (something removed). It is often confused with punishment in everyday speech.
• Exposure: grew out of Joseph Wolpe's systematic desensitization and became the core of evidence-based anxiety treatment. Explanations shifted from habituation toward new learning (inhibitory learning).