True about autism –
Autism 

Autism is a neurologic disroder characterized by -


Qualitative impairment in social interaction
Qualitative impairment in communication.
Restricted repetitive and streotyped patterns of behaviour, interests, and activities.


Onset of symptoms is usually before 3 years of age.
3-5 times more common in boys, but more severe when occurs in girls.
More common among low socio-economic groups.

Clinical features

Impairment in communication
Impairment in social interaction
Inability to concentrate
Restricted repetitive and streotypes patterns of behaviour, interests and activities.
Failure to acquire speech.
Approximately 75% of children with autism are mentally retarded.
Epilepsy develops in approximately one-fifth to one-third individuals.
Half of autistic patients have abnormalties on EEG.
Occurs in high economic striata
Normal communication
Starts before 2–3 years of age
More common in girls
Starts before 2–3 years of age