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The meaning of the face: How critical is it to our sense of identity, and relationship with others? Sharrona Pearl, Assistant Professor in Communications at the University of Pennsylvania, discusses her study of face transplant surgery. She's joined by Anne-Marie Martindale, Post-Doctoral Research Associate at the University of Manchester, who has studied the impact of facial disfigurement; as well as Professor Jonathan Cole, consultant in clinical neurophysiology, and author of two books examining the relationship between facial expressions, communication and the self. Revised repeat. Producer: Jayne Egerton.