The human visual system is particularly attuned to and remarkably efficient at processing social cues. We can effectively "read" others' mental and emotional states and make snap judgments about their characters and dispositions, simply by watching them. Given what is clearly a close relationship between vision and social interaction, it has become increasingly clear to social psychologists seeking to better understand the functional and neuroanatomical mechanisms underlying social perception that vision plays a critical role in the development and maintenance of social exchange. Likewise,...