This study examines the flexibility with which children can use pragmatic information to determine word reference. Extensive previous research shows that children choose an unfamiliar object as referent of a novel name: the disambiguation effect. We added a pragmatic cue indirectly indicating a familiar object as intended referent. In three experiments, preschool children's ability to take this cue into account was specifically associated with false belief understanding and the ability to produce familiar alternative names (e.g., rabbit, animal) for a given referent. The association was predicted by the hypothesis that all three tasks require an understanding of perspective (linguistic or mental).The findings indicate that perspectival understanding is required to take into account indirect pragmatic information to suspend the disambiguation effect. Implications for lexical principles and socio-pragmatic theories of word learning are discussed.Keywords: word learning, mutual exclusivity bias, disambiguation effect, theory of mind, metacognition METACOGNITIVE DEVELOPMENTS IN WORD LEARNING 4 Metacognitive developments in word learning:Mutual Exclusivity and theory of mind A frequent observation, both in word learning research and in everyday life, is that young children appear to assume that each object kind has only one name. This tendency can be demonstrated experimentally using what is known as the disambiguation paradigm (e.g., Markman & Wachtel, 1988;Merriman & Bowman, 1989). In the presence of a familiar nameable object and an unfamiliar object children are asked to pick the referent of a novel name. For example, when shown a familiar apple, and an unfamiliar whisk, and asked to pick the "hinkle", children typically choose the novel object. This disambiguation effect is very robust and has been extensively used in research. It can be demonstrated from late infancy (e.g., Halberda, 2003;Markman, Wasow, & Hansen, 2003). It also constitutes a test case for differing theories about the nature of word learning, and about the relationship between word learning and metacognitive development. Determining the underlying cause of disambiguation is of broad theoretical importance.There are three general explanations of the phenomenon. (Others have proposed combinations of these explanations or hybrid accounts, e.g., Hollich, Hirsh-Pasek, & Golinkoff, 2000a, but we focus on these three for brevity.) The phenomenon is frequently identified as the 'Mutual Exclusivity bias ' (e.g., Markman, 1989;Merriman & Bowman, 1989), based on the idea that children assume word extensions to be mutually exclusive.Other lexical principles accounts have been proposed in which children prefer to map novel names to nameless categories (N3C; Golinkoff, Mervis, & Hirsh-Pasek, 1994) or vice versa (bias to fill lexical gaps, Merriman & Bowman, 1989). Unlike the Mutual Exclusivity bias, neither account predicts difficulty mapping novel names to nameable categories if other options are not apparent.
METACOGNITIVE DEVELOPMENTS IN WORD...