Stimming is a repetitive body movement that self-stimulates one or more senses in a regulated manner. Stimming is known in psychiatry as a "stereotypy", a continuous, purposeless movement.
Stimming is one of the symptoms listed by the DSM IV for autism, although it is observed in about 10 percent of young children without autism. Many children with autism have no stims. Common forms of stimming among people with autism include hand flapping, body spinning or rocking, lining up or spinning toys or other objects, echolalia, perseveration, and repeating rote phrases.