In §4, we describe the current understanding of how the brain responds to emotionally neutral faces. In §3, we discuss cortical systems for the perception of facial expressions, and argue for a partial segregation of function in the superior temporal sulcus and the fusiform gyrus. In §2, we describe three types of behavioural evidence that the perception of traits in neutral faces is related to the perception of facial expressions, and may rely on the same mechanisms. In this overview, we discuss the current understanding in the field, and describe what is known and what remains unknown. Nevertheless, large questions remain unanswered. Cognitive neuroscience research on facial expression recognition and face evaluation has proliferated over the past 15 years.
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