These are the behavior symptoms: aggression, persistent repetition of words or actions, repetitive movements, social isolation, self-harm, compulsive behavior, antisocial behavior, impulsivity, screaming, hyperactivity, or fidgeting More to it than that It's also classed as autism: repetitive movements, meaningless repetition of own words, irritability, involuntary imitation of someone else's movements, persistent repetition of words or actions, aggression, excitability, self-harm, compulsive behavior, impulsivity, screaming, poor eye contact, nonsense word repetition, crying, inappropriate social interaction, or hyperactivity