Mondo Description Motor behavior that is repetitive, often seemingly driven, and nonfunctional. This behavior markedly interferes with normal activities or results in severe bodily self-injury. The behavior is not due to the direct physiological effects of a substance or a general medical condition. (dsm-iv, 1994)

Disease Ontology Description A specific developmental disorder that is characterized by repeated, rhythmic, purposeless movements or activities such as head banging, nail biting, or body rocking.