A psychological therapy and an umbrella term for a range of interventions including exposure and response prevention and behavioural activation (see below). Behaviour therapy, also called behaviour modification or behavioural psychotherapy refers to the use of learning theory in the treatment of psychological disorders. It is based on the belief that psychological problems are caused by faulty learning rather than a medical disease. BT aims primarily to help people to manage/change unhelpful behaviours. For example, in OCD, behaviour therapy often involves confronting feared situations (exposure) and refraining from performing rituals (response prevention). For OCD and BDD, BT is often synonymous with exposure and response prevention (see below).