1. Compulsions in adults with mental retardation: Prevalence, phenomenology, and comorbidity with stereotypy and self-injury: American Journal on Mental Retardation Vol 100(2) Sep 1995, 183-192

2. Extreme repetitive Behaviors such as hand-flapping, body-rocking, skin-picking and sniffing are common to a number of brain disorders including autism, schizophrenia, Huntington’s disease, and drug addiction.These Behaviors, termed stereotypies, are also apparent in animal models of drug addiction and autism.

3. Extreme repetitive Behaviors such as hand-flapping, body-rocking, skin-picking, and sniffing are common to a number of brain disorders including autism, schizophrenia, Huntington’s disease, and drug addiction.These Behaviors, termed stereotypies, are also apparent in animal models of drug addiction and autism.