This study investigates 3-to 5-year-old children's sensitivity to lexical, intonational, and gestural information in the comprehension of speaker uncertainty. Most previous studies on children's understanding of speaker certainty and uncertainty across languages have focused on the comprehension of lexical markers, and little is known about the potential facilitation effects of intonational and gestural features in this process. A total of 102 3-to 5-year-old Catalan-speaking children participated in a comprehension task which involved the detection of uncertainty in materials that combined lexical, intonational, and gestural markers. In a between-subjects design, the children were either administered the lexical condition (where they were exposed to lexical and gestural cues to uncertainty) or the intonation condition (where they were exposed to intonational and gestural cues to uncertainty. Within each condition, three different presentation formats were used (audio-only, visual-only and audiovisual) in a within-subjects design. Our results indicated that all the children performed better overall when they had gestural cues present. Furthermore, in comparison with the older group, the younger group was more sensitive to intonational marking of speaker uncertainty than to lexical marking. This evidence suggests that the intonational and gestural features of communicative interactions may act as bootstrapping mechanisms in early pragmatic development.
Gesture and prosody are considered to be important precursors in early language development. In the present study, we ask whether those cues play a similar role later in children's acquisition of more complex pragmatic skills, such as politeness. 64 three- to five-year-old Catalan-dominant children participated in a request production task in four different conditions. They were prompted to request an object from either a classmate or an unfamiliar adult experimenter, with the implied cost of the request to the receiver's face thus being either high or low. Results showed that these preschool-age children used mitigating prosodic and gestural strategies to encode politeness earlier and more often than they used lexical or morphosyntactic markers, and that those cues develop incrementally during the preschool years. These findings suggest that prosody, gesture, and other body signals are an essential first step in the development of children's socio-pragmatic competence.
Children might combine gesture and prosody to express a pragmatic meaning such as a request, information focus, uncertainty or politeness, before they can convey these meanings in speech. However, little is known about the developmental trajectories of gestural and prosodic patterns and how they relate to a child's growing understanding and propositional use of these sociopragmatic meanings. Do gesture and prosody act as sister systems in pragmatic development? Do children acquire these components of language before they are able to express themselves through spoken language, thus acting as forerunners in children's pragmatic development? This review article assesses empirical evidence that demonstrates that gesture and prosody act as intimately related systems and, importantly, pave the way for pragmatic acquisition at different developmental stages. The review goes on to explore how the integration of gesture and prosody with semantics and syntax can impact language acquisition and how multimodal interventions can be used effectively in educational settings. Our review findings support the importance of simultaneously assessing both the prosodic and the gestural components of language in the fields of language development, language learning, and language intervention.
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