Autism is a rare psychological disorder that has been the subject of much research.
There are four main symptoms that partially identify the disorder. The second sign of autism is prolonged repetitive behaviors. These children may spend hours performing one or two actions with a single object or with their own bodies. Autistic children feel and express emotion but have a difficulty in making sense of other people's emotions. As with deficits in imitation and joint attention behaviors, the effects of insufficient social referencing behavior are far-reaching and cumulative.