Mike Robinson, assistant professor of psychology, assistant professor of neuroscience and behavior, is the author of an article published Sept. 27 in Current Topics in Behavioral Neuroscience. Titled, “Roles of ‘Wanting’ and ‘Liking’ in Motivating Behavior: Gambling, Food, and Drug Addictions,” the article is co-authored by Adam Fischer, previously Robinson’s lab manager, Aarit Ahuja ’16, Hannah Maniates ’16, and Ellen Lesser ’15.
In this paper, the authors argue that two separate but interconnected subcortical and unconscious processes direct motivation: “wanting” and “liking.” These two processes work together but can become disassociated, especially in cases of addiction. For example, in drug addiction, repeated consumption of drugs sensitizes the mesolimbic dopamine system–the primary component of the “wanting” system–resulting in excessive “wanting” for drugs and their cues. This long-lasting change occurs independently of the “liking” system, which typically remains unchanged or may develop a blunted pleasure response to the drug. This results in excessive drug-taking despite minimal pleasure and intense cue-triggered craving that may promote relapse long after detoxification.
The authors describe the roles of “wanting” and “liking” in general motivation and review recent evidence for a dissociation of “liking” and “wanting” in drug addiction, known as the incentive sensitization theory. They also make the case that sensitization of the “wanting” system and the resulting dissociation of “liking” and “wanting” occurs in both gambling disorder and food addiction.