When a child with autism spectrum disorder jumps, flaps her arms, twists her hands and fingers, and makes unusual faces, the child is engaging in: ?

The child is engaging in "Self-stimulatory behavior".

Self-stimulatory behavior alludes to redundant body actions or repeated movement of articles. This conduct is usually seen in numerous people with developmental inabilities; in any case, it seems, most commonly, to be more typical in autism. Actually, if a man with another developmental handicap shows a type of self-stimulatory conduct, frequently the individual is likewise marked as having autistic attributes.

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