Perhaps caregivers are following in, i.e., talking about objects that their children are interested in (Baldwin, 1991).
each utterance in the corpus contains the follow-ing information: • the sequence of orthographic words uttered by the care-giver, • a set of available topics (i.e., objects in the nonlinguistic objects), • the values of the social cues, and • a set of intended topics, which the care-giver refers to.