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Time course of looking to target picture in three determiner conditions in Experiment 1: (A) 18-month-olds; (B) 24-month-olds; (C) 36-month-olds. Curves depict changes in proportion of looking over time to picture named by familiar target word preceded by grammatical article (squares), no article (circles), and nonce article (triangles). The vertical dashed line indicates the offset of the target word.
