Catatonia and autism spectrum disorder: A common comorbid syndrome or a core feature?

Table 1 Summary of Diagnostic and Statistical Manual of Mental Disorders-III-R diagnostic criteria for autism disorder

Qualitative impairments in reciprocal social interaction	Impairment in communication	Restricted interest/resistance to change and repetitive movements
Lack of awareness	No communication	Stereotypies
Seeking comfort	Abnormal nonverbal	Parts of objects
Imitation	Imaginative activity	Environmental change
Social play	Production-speech	Insistence-routine
Peer friendship	Form/content-speech	Restricted interests
	Conversation