People are special. Person perception is quite different from rock perception, for example. Geologists, those with a rock in their shoe, and pet rock owners aside, the perception of a rock is often merely the perception of a collection of lines and surfaces. Yet people are not simply collections of lines and surfaces. People have inner worlds such as mental states and emotions, and unique expressions of those inner worlds, such as personalities, emotional expressions, and behaviors. The study of person perception examines how we perceive people and infer their inner worlds from our...