Prenatal exposure alters brain reward circuits and psychosis risk

This study investigates the long-term neurological effects of prenatal cannabis exposure (PCE) on children and adolescents, specifically examining how it may increase risk for psychotic-like experiences (PLEs). As cannabis legalization expands and use during pregnancy rises, researchers examined whether disrupted reward-processing brain circuits could explain the connection between PCE and early psychosis symptoms. The study focused on reward anticipation, a brain function heavily influenced by the endocannabinoid system and dopamine pathways, which are known to play critical roles in both normal development and psychosis risk.

The findings reveal that youth exposed to cannabis before birth showed altered brain responses during reward anticipation tasks, suggesting fundamental changes in how their dopaminergic reward circuits function. These neurological differences appeared to predict the development of psychotic-like experiences, which can include hallucinations, paranoia, or unusual perceptual experiences. This research provides important evidence that PCE may alter developing brain reward systems in ways that increase vulnerability to psychosis-related symptoms during critical developmental periods. The study highlights a potential biological mechanism linking maternal cannabis use to psychiatric risks in offspring.

These results carry significant implications as cannabis use becomes more normalized and accessible, particularly for pregnant individuals who may perceive it as safe or use it to manage pregnancy symptoms like nausea. Understanding that prenatal exposure can fundamentally alter reward-processing brain circuits underscores the importance of clear public health messaging about potential developmental risks during pregnancy, even as cannabis becomes legal in more jurisdictions.