of autonomic arousal associated with positive emotional events (Rudebeck et al., 2014). From this perspective, social prediction errors in sgACC might reflect the relevance of other people for one’s own emotional state triggering changes in emotional arousal. On the other hand, studies of non-social decision-making have identified sgACC (area 25, (Palomero-Gallagher et al., 2015), Figure 1) responses to hierarchical prediction errors during sensory associative learning (Iglesias et al., 2013) linking this area to stimulus-outcome learning at levels of abstraction, perhaps similar to the type of abstract computations involved in real-life social interactions (Ruff and Fehr, 2014; Schilbach et al., 2013). However, sgACC is not traditionally characterised as part of the social brain, namely, areas that are preferentially recruited during social-cognitive processes.
