“…For example, among people with and without mental handicaps, happiness has been found to be more easily recognised than other emotional states (Maurer & Newbrough, 1987a;Ekman, 1982;Gray, Fraser & Leudar, 1983). Although in one study care staff claimed to be able to identify sadness in clients with mental handicaps, inter-rater agreement on its behavioural indicators was low (Clark, Reed & Sturmey, 1991). Of course, encoding success in communicating emotions is dependent on decoder sensitivity.…”