In addition to the physical, cognitive and psychological symptoms experienced by individuals with Multiple Sclerosis (MS), there is new research which indicates that some individuals with MS have a deficit in emotional processing, specifically, facial affect recognition. Emotional processing is defined as "a central aspect of social cognition". Models of social cognition indicate that emotional processing is an essential component of interpersonal relationships. The failure to accurately perceive other's emotions has been shown to lead to difficulty in social relationships, misinterpreting other's affect, and consequently, inappropriate responding.