The term, an acronym for Obsessive Compulsive Disorder, refers to a mental health condition that affects one in 100 children worldwide. It is characterised by recurrent, unwanted thoughts which lead to anxieties manifesting as repetitive behaviours.
Female patient chained to a post in an 18th century mental asylum. Methods of constraint such as this were often used because patients were seen as being dangerous. It also made the job easier for the few warders assigned to look after the patients. In 1792, the French physician Philippe Pinel was the first to realize that such deprivation of movement & light actually worsened patients' mental conditions.