FIGURE 3.

The distribution of common object categories in head camera images of 8- to 10-month-old infants (Clerkin et al., 2017). Object categories are colored based on norms for their age of acquisition (Fenson et al., 1994): first nouns (object names that are in the receptive vocabulary of at least 50% of 16-month-old infants), early nouns (object names that are not first nouns and in the productive vocabularies of at least 50% of 30-month-old children), and later nouns (all other object names).