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Comparisons of the mean proportions of crawling, upright, and walking bouts that co-occurred with (A) overall language input, (B) verbs about actions, and (C) descriptive language about objects. Solid lines are data for crawling bouts; dotted lines for upright bouts; and dashed lines for walking bouts. Error bars show standard errors. Asterisks denote statistical significance in pairwise comparisons between bout types: *p < .05, **p < .01, ***p < .001
