Chronic alcohol exposure leads to brain adaptations that shift behavior control away from an area of the brain involved in complex decision-making and toward a region associated with habit formation, according to a new study conducted in mice by scientists at the National Institutes of Health.
The finding provides a biological mechanism that helps to explain compulsive alcohol use and the progression to alcohol dependence. A report appears online in the Proceedings of the National Academy of Sciences (PNAS).
The brain’s prefrontal cortex is involved in decision-making and controlling emotion, while the dorsal striatum is thought to play a key role in motivation and habit formation. Past studies have shown that alcohol dependent individuals show problems with skills mediated by the prefrontal cortex such as impulse control. These same individuals often show exaggerated neural response in the dorsal striatum to alcohol-related cues. > > > > Read More