sir ,my son 7yrs autistic child(regressed type),draws the hands in front of eyes and vigorously shake the hands (from fore arms only) and at that time the trunk is stiff and he will do it for few minutes. some times he vigarously shake the either of the lower limbs of hands. is chorea or tic disorder.more over these symtoms appear only during when he is excited and symptom free during sleep. thank you