The communicative behavior of autistic and developmental language delay (DLD) children matched for nonverbal mental age and mean length of utterance (MLU) was compared to that of normally-developing (ND) 2-yr-olds. Autistic children were less able than other children to respond correctly to language or gestures used to direct their attention, used attention directing (pointing, showing) less frequently, and produced more echolalic speech when making requests. DLD and ND children differed only in number of pronouns used while requesting. Attention-directing gestures were associated with receptive and expressive language abilities for autistic, DLD and normal children.
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Landry et al. (1988) studied this question.
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