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1979) found that communicative pointing was the best predictor of early linguistic performance. They defined "communicative pointing" in two quite distinct ways. First, they counted instances where children pointed toward an object while looking at their mothers or other conversational partners, either solely or in alternation with the object. , sitting on an adult's lap while jointly looking at a book" (p. 135) whether or not they involved gaze toward the adult. Murphy (1978), in fact, reported that visual regard of an adult's face rarely occurred in that situation.

To assess the predictive power of variation in infant joint engagement, we did a multiple regression analysis. First, we regressed the variable vocabulary size on the percentage of time infants spent unengaged. This step let us look at whether or not knowing just how much infants focused attention per se predicted later vocabulary. We found that it did not. In the second step, we entered the percentage of time spent in joint engagement during the lO-min play period to see if predictability improved over that obtained when considering only the engaged/unengaged distinction.

Mothers directed attention using conventional acts between 5% and 58% of the condition. 60). Secondly, we considered how differences in the way mothers used language might have affected their infants' vocabulary size. "'). 3) referential, social-regulative, and metalingual utterances, respectively. Vocabulary size was predicted by the functions of mothers' utterances. In the regression analysis, we first entered mothers' verbalization rate to control for sheer level of talkativeness. Sheer talkativeness did not let us predict vocabulary size (adjusted R2 = 0).

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Adventures with Mac

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