Music Reward Sensitivity Associated With Frontostriatal Function and Structure in Congenital Amusia

Congenital amusia is a neurodevelopmental disorder affecting musical ability. Previous studies have demonstrated that music reward sensitivity has both functional and structural bases. However, the nature of music reward sensitivity and its neural underpinnings in amusia remains unclear. This study combined the Barcelona Music Reward Questionnaire and magnetic resonance imaging to investigate resting-state functional and structural correlates of music reward sensitivity in individuals with amusia. Behavioral results indicate individuals with amusia exhibit reduced sensitivity to music, including social rewards, mood regulation, emotional evocation, sensorimotor processing, and music seeking. Brain imaging revealed abnormalities in several classic cognitive and reward-related functional and structural brain areas. Specifically, individuals with amusia have abnormal resting-state functional activity in the right inferior frontal gyrus (IFG) along with altered functional and structural connectivity between the IFG and the striatum. Notably, reduced sensorimotor sensitivity to music in amusia is associated with increased resting-state functional activity in the IFG and enhanced structural connectivity between the IFG and nucleus accumbens (NAcc). Furthermore, the function of the IFG appears to influence the sensorimotor sensitivity via the IFG-NAcc structural connectivity in amusia. These findings suggest the cognitive system and its interactions with the reward system play crucial roles in developmental music disorder.