Autism, also known as autism or autistic disorder, among others, is a representative disorder of pervasive developmental disorder (PDD). The DSM-IV-TR categorizes PDD into five types: autistic disorder, Retts syndrome, childhood disintegrative disorder, Asperger syndrome, and unspecified PDD.
Of these, autistic disorder and Asperger syndrome are more common. Reports of the prevalence of autism vary, and it is generally thought to be about 2 to 5 per 10,000 of the child population, with a male-to-female ratio of about 1:3 to 1:4, and symptoms are generally more severe in girls than in boys.
Extended information:
People with autism display multiple forms of conservative or restrictive behavior, of which the Revised Behavioral Scale for Conservative Behavior (RBS-R) categorizes as follows.
1. Strictly old-fashioned movements, self-stimulating behaviors, and unwillingness to change, such as hand flapping, head bobbing, or body swinging.
2. Obsessive-compulsive behaviors, such as arranging objects to appear stacked or in lines, or forcing people to accommodate, etc.
3. Rehashing is resistance to behavior change, such as insisting that furniture not be moved or refusing to have behavior interrupted.
4. Ritualistic behavior, on the other hand, involves a pattern of unwillingness to change habits, especially favorite things, such as unwillingness to change one's speech, or unwillingness to change schools, and so on. This is closely related to Lehigh already suggests combining the two.
5. Restrictive behaviors are those that include limitations and narrowness of interest, concentration or activity, persistent focus on certain parts of objects such as wheels, etc., and an abnormal level of attention to objects/things of interest compared to normal.
6. Self-injury includes actions that hurt oneself or may hurt others, such as poking the eyes, pinching the skin, biting the hand or banging the head.
Reference:
Baidu Encyclopedia Autism