Chapter 5: drugs of abuse: recreational drug taking a drug just so you can experience the drugs effects. Instrumental drug a drug used for a socially accepted purpose. Drug addiction fits in the medical definition of a disease. Drugs elicit powerful positive reinforcing effects that drive. Individuals seek drugs to avoid or remove withdrawal effects individuals to seek and use drugs. Stimuli associated with drug use receive salient incentive value. These stimuli then command a user"s attention and produce a motivational state for drug seeking. In this theory, it suggests that drug addiction occurs partly due to a person trying to prevent withdrawal symptoms from occurring: withdrawal symptoms = negative reinforcement t. I-s model also helps to explain relapses: incentivized stimuli may engage motivational state for drug use. Neurobiology and the stages of drug addiction: drug-addiction cycle. Amygdala, hypothalamus, psychological withdrawal effects or both and ans.