PSYC 211 Lecture Notes - Lecture 14: Knockout Mouse, Arain, Incentive Salience
Document Summary
An overpowering desire or need (compulsion) tocontinue taking the drug and obtain it by any means. Drug addicts are habitual drug users who continue to take a drug despite its adverse effects on their health and social life. Addictive drugs stimulate brain mechanisms of reinforcement responsible for positive reinforcement. Video: the mind second edition: brain mechanisms of pleasure and behavior. Drugs that lead to addiction must reinforce the behavior. Positive reinforcement: positive reinforcement increases the frequency of behavior because it is regularly followed by an appetitive stimulus. Negative reinforcement: negative reinforcement increases the frequency of behavior because of the removal of an aversive stimulus. Ex: a rat will press a lever (the behavior) to prevent the occurrence of a foot shock (the aversive stimulus): negative reinforcement is not the same as punishment. Negative reinforcement increases frequency of behavior, ex: if i take another shot, my withdrawal symptoms will disappear.