Cultural differences in anterior cingulate cortical response to prediction error

Previous studies have shown cultural differences in the behavioral and neural processes of perspective taking and social emotional processing. It is less clear whether culture influences cognitive functions that do not explicitly involve face perception, group membership or social interactions. Here, we addressed this issue by imaging 29 Asians and 168 European Americans while they performed a stop signal task (SST)—a behavioral paradigm widely used to study cognitive control. In the SST participants responded to a frequent go signal and interrupted their response to an infrequent stop signal. Imaging data were processed by published routines implemented in Statistical Parametric Mapping. Behaviorally Asians and European Americans did not differ in SST performance measures, including the go and stop success rates, go and stop signal reaction time, and the sequential effect, an index of performance monitoring and behavioral adjustment. In a Bayesian model of the SST performance, we identified regional responses to stimulus prediction error (expecting go while encountering stop signal or vice versa) and showed that the dorsal anterior cingulate cortex (dACC) responded to Bayesian prediction error, a surprise signal. Importantly, compared to European Americans, Asians showed higher dACC response to prediction error in a voxelwise analysis examined at a corrected threshold. This finding suggested that, although an increased response to surprise did not impact behavioral performance, Asians appeared to exhibit higher arousal to a salient signal than European Americans, a process likely mediated by midbrain catecholaminergic system. This finding supports racial cultural differences in cognitive and affective processes that go beyond the domains of social emotions, and adds to a growing literature of cultural neuroscience.