Pavlov’s dogs became famous in 1927 for learning that the sound of a bell meant that food was coming. Today, scientists are still interested in understanding how sights, smells, sounds, and places can come to influence our behavior. These things are called cues and contexts. In drug addiction, people experience cues and contexts and drugs around the same time and formmental links or associations between the cues/contexts and the drugs. These mental links can motivate people to seek out drugs even if they are trying to quit. By studying the brain as these mental links are being formed or broken, researchers are learning about one of the things that keeps people frombreaking their addictions, and they are improving the therapies available to help people who are addicted to drugs.