Eye movement desensitisation and reprocessing (EMDR) is a form of psychotherapy developed by Francine Shapiro in the 1990s in which the person being treated is asked to recall distressing images; the therapist then directs the client in one type of bilateral sensory input, such as side-to-side eye movements or hand tapping. It is included in several evidence-based guidelines for the treatment of post-traumatic stress disorder (PTSD).