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What does hand movement have to do with language and communicative development? This Introduction proposes that language acquisition researchers have at least four reasons to be interested in gesture and communicative development. First, children begin to gesture before talking. Second, children continue to gesture even after they start to talk, and through to adulthood. Third, recent theoretical perspectives on language acquisition have advanced a functional approach to communicative development in which usage is crucial in language acquisition. Fourth, the argument that spoken language evolved from gestures raises intriguing questions about the relationship between phylogenesis and ontogenesis. We outline different developmental trajectories for different kinds of gestures, developmental changes in the relationship between speech and gestures, and the developmental analysis of gesture functions. The six new empirical studies reported in this Special Issue are summarized.

The majority of studies on animal communication provide evidence that gestural signalling plays an important role in the communication of non-human primates and resembles that of pre-linguistic and just-linguistic human infants in some important ways. However, ape gestures also differ from the gestures of human infants in some important ways, and these differences might provide crucial clues for answering the question of how human language — at least in its cognitive and social-cognitive aspects — evolved from the gestural communication of our ape-like ancestors. This article provides an overview on the gestural signalling of monkeys and apes to enable a comparison with gestures in pre- or just-linguistic children. Implications for the evolution of language are discussed.

Pragmatic language skills (e.g., communicative intention) have traditionally been difficult to measure consistently in young children. This challenge makes it difficult to establish links between early productive speech/ language behaviors (e.g., intonation) and communicative intentions, which may prove to be useful for early diagnosis of speech and language impairment. The current study proposes a methodology for observing and measuring language produced by children in the single-word developmental stage that does not rely on usual linguistic cues (e.g., lexical meaning). The goals of this study were: (1) to determine whether young children (i.e., ages 1;0—1;11) coordinated their nonverbal and verbal behavior directions; and (2) to determine whether there were any into-national and intentional differences between utterances produced with coordination compared with those produced without coordination. Our findings suggest that, even at the one-word stage of language acquisition, young children are beginning to adhere to the adult tendency to coordinate nonverbal and verbal behaviors, and that intentional meaning is more comprehensible when gesture and intonation contour are coordinated.

Italian children are immersed in a gesture-rich culture. Given the large gesture repertoire of Italian adults, young Italian children might be expected to develop a larger inventory of gestures than American children. If so, do these gestures impact the course of language learning? We examined gesture and speech production in Italian and US children between the onset of first words and the onset of two-word combinations. We found differences in the size of the gesture repertoires produced by the Italian vs. the American children, differences that were inversely related to the size of the children's spoken vocabularies. Despite these differences in gesture vocabulary, in both cultures we found that gesture + speech combinations reliably predicted the onset of two-word combinations, underscoring the robustness of gesture as a harbinger of linguistic development.

Children vary widely in how quickly their vocabularies grow. Can looking at early gesture use in children and parents help us predict this variability? We videotaped 53 English-speaking parent-child dyads in their homes during their daily activities for 90-minutes every four months between child age 14 and 34 months. At 42 months, children were given the Peabody Picture Vocabulary Test (PPVT). We found that child gesture use at 14 months was a significant predictor of vocabulary size at 42 months, above and beyond the effects of parent and child word use at 14 months. Parent gesture use at 14 months was not directly related to vocabulary development, but did relate to child gesture use at 14 months which, in turn, predicted child vocabulary. These relations hold even when background factors such as socio-economic status are controlled. The findings underscore the importance of examining early gesture when predicting child vocabulary development.

This study explores how French adults and children aged four and six years talk and gesture about voluntary motion, examining (1) how they encode path and manner in speech, (2) how they encode this information in accompanying gestures; and (3) whether gestures are co-expressive with speech or express other information. When path and manner are equally relevant, children's and adults' speech and gestures both focus on path, rather than on manner. Moreover, gestures are predominantly co-expressive with speech at all ages. However, when they are non-redundant, adults tend to gesture about path while talking about manner, whereas children gesture about both path and manner while talking about path. The discussion highlights implications for our understanding of speakers' representations and their development.

The repertoire and timing of gestures accompanying speech were compared in children with specific language impairment (SLI), aged 5—10 years, in typically developing peers (CA), individually matched on age and nonverbal IQ, and in younger language-matched (LM) children. They were videotaped in two tasks, recounting a cartoon and describing their classroom. Three types of gestures were coded — iconics, deictics and beats — and the synchrony of these gestures with speech was examined in terms of number of words encompassed, grammatical speech category at gesture onset, and relationship of iconic gestures to the concept expressed in speech. All groups used more deictic gestures in the classroom description task. SLI children differed from the comparison children only in their use of iconic gestures. They produced somewhat more of these, used them more often to replace words, and began them more often on a noun phrase object. Otherwise, language proficiency, at least as measured by standardized tests, did not appear to impact the gestural system. The fact that, for all groups, most iconic and deictic gestures began on the noun phrase subject indicates a close synchrony between gesture and speech onset.