Elevated loss sensitivity in the reward circuit in adolescents with video game but not social media addiction

Both video game addiction (VGA) and social media addiction (SMA) have been linked to dysfunction of the brain reward circuit. However, it remains unclear whether VGA or SMA have a bidirectional relationship with reward circuit dysfunction during development. The current study used a large longitudinal dataset from the Adolescent Brain and Cognitive Development (ABCD) study to explore the association between VGA, SMA, and longitudinal changes in neural processing of rewards and losses during a monetary incentive delay task. Significant VGA × time interactions were observed for loss-related neural activity were observed in left nucleus accumbens, bilateral insula, and right anterior cingulate cortex (ACC). Simple slope analysis revealed an increasing trend in neural responses to losses among participants with high levels of VGA. Additionally, time × neural loss sensitivity interactions predicted later VGA in the right amygdala and right ACC, suggesting that heightened loss sensitivity both influences and is influenced by VGA. In contrast, SMA showed no significant longitudinal associations with reward or loss sensitivity. These findings highlight a bidirectional relationship between VGA and neural loss sensitivity, while SMA was not implicated in similar patterns. These findings may provide valuable insights into the neural mechanisms underlying behavioral addiction.