Have disease normally at 3 years old of less than.
· contacts association obstacle:

① cannot be used look attentively at, expression, pose or gesticulation have society;

② cannot establish companionate relationship with other child;

When ③ encounters a setback, won't seek support or comfort. When others encounters a setback, also won't give actively others supports and comfort;

④ cannot produce resonance to collective joy.

Obstacle of · utterance association:

Defer of ① verbal development or not development, replace the liability of utterance communication with gesticulation or other form;

If ② has somehow verbal function, also lack active or persistent utterance communication;

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