Face perception and categorization is fundamental to social interactions. In humans, input from facial features is integrated with top-down influences from other cognitive domains, such as expectations, memories and contextual knowledge. For instance, whether a face is perceived as depicting an angry expression may depend on prior knowledge about the context (Aviezer et al., 2007) or person (Abdel Rahman, 2011; Suess, Rabovsky & Abdel Rahman 2014). Furthermore, humans have a strong tendency to infer traits such as trustworthiness directly from faces.