New Haven, Conn., Apr 03: A new study from researchers at Yale School of Medicine provides fresh insight into how craving—a powerful urge for substances—shapes decision-making in people with addiction, offering potential pathways for more targeted treatments.
Published in Nature Mental Health, the research highlights how craving not only drives behavior but also alters how individuals learn from rewards and experiences—key factors in the persistence of addictive disorders.
“Addiction is very hard to treat, and one of the reasons is that we don’t fully understand the craving linked with it,” said Xiaosi Gu, senior author of the study and director of the Computational Psychiatry Unit at Yale.
The study involved 132 participants who reported moderate to heavy use of alcohol or cannabis. Researchers used a behavioral task involving two slot machines, where participants aimed to maximize rewards. While one machine offered higher chances of winning, its identity changed throughout the experiment, requiring participants to continuously adapt their choices.
When rewards were monetary, participants quickly learned to identify and switch between the most rewarding options. However, when rewards were replaced with substance-related cues—such as images of alcohol or cannabis—their craving levels significantly influenced their decision-making patterns.
According to Kaustubh R Kulkarni, first author of the study, craving affected learning differently depending on the substance. Among alcohol users, higher craving accelerated learning and reinforced reward-seeking behavior. In contrast, among cannabis users, stronger craving slowed the learning process.
“These findings suggest that craving can fundamentally alter how people learn from outcomes,” Kulkarni explained. “There appears to be a distinct difference in how alcohol and cannabis impact the brain’s decision-making mechanisms.”
The researchers used advanced computational models to analyze behavior, uncovering what they describe as “computational dysfunction” in addiction. This dysfunction may help explain why addictive behaviors are difficult to break, as the brain continuously adapts in response to craving and reward signals.
The study opens new avenues for treatment by identifying specific behavioral and neurological patterns associated with craving. Future research, including neuroimaging studies supported by the Yale Biomedical Imaging Institute, aims to pinpoint the brain circuits involved.
Researchers believe that these findings could eventually lead to personalized treatments using pharmacological approaches, brain stimulation, or psychotherapy tailored to individual neural and behavioral profiles.
“My hope is that these behavioral tools can be used in clinical settings, even remotely, to assess patients and guide treatment,” Gu added. “Understanding craving at this level could also have implications beyond addiction, including conditions like eating disorders and social isolation.”
While clinical applications may still be years away, the study marks a significant step toward decoding the complex relationship between craving and decision-making—bringing researchers closer to more effective interventions for addiction.
