During communication, speakers commonly rotate their forearms so that their palms turn upward. Yet despite more than a century of observations of such palm-up gestures, their meanings and origins have proven difficult to pin down. We distinguish two gestures within the palm-up form family: the palm-up presentational and the palm-up epistemic. The latter is a term we introduce to refer to a variant of the palm-up that prototypically involves lateral separation of the hands. This gesture-our focus-is used in speaking communities around the world to express a recurring set of epistemic meanings, several of which seem quite distinct. More striking, a similar palm-up form is used to express the same set of meanings in many established sign languages and in emerging sign systems. Such observations present a two-part puzzle: the first part is how this set of seemingly distinct meanings for the palm-up epistemic are related, if indeed they are; the second is why the palm-up form is so widely used to express just this set of meanings. We propose a network connecting the different attested meanings of the palm-up epistemic, with a kernel meaning of absence of knowledge, and discuss how this proposal could be evaluated through additional developmental, corpus-based, and experimental research. We then assess two contrasting accounts of the connection between the palm-up form and this proposed meaning network, and consider implications for our understanding of the palm-up form family more generally. By addressing the palm-up puzzle, we aim, not only to illuminate a widespread form found in gesture and sign, but also to provide insights into fundamental questions about visual-bodily communication: where communicative forms come from, how they take on new meanings, and how they become integrated into language in signing communities.

Humans communicate using language, but they also communicate using gesture – spontaneous movements of the hands and body that universally accompany speech. Gestures can be distinguished from other movements, segmented, and assigned meaning based on their forms and functions. Moreover, gestures systematically integrate with language at all levels of linguistic structure, as evidenced in both production and perception. Viewed typologically, gesture is universal, but nevertheless exhibits constrained variation across language communities (as does language itself ). Finally, gesture has rich cognitive dimensions in addition to its communicative dimensions. In overviewing these and other topics, we show that the study of language is incomplete without the study of its communicative partner, gesture.

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Human languages, signed and spoken, can be characterized by the structural patterns they use to associate communicative forms with meanings. One such pattern is paradigmatic morphology, where complex words are built from the systematic use and re-use of sub-lexical units. Here, we provide evidence of emergent paradigmatic morphology akin to number inflection in a communication system developed without input from a conventional language, homesign. We study the communication systems of four deaf child homesigners (mean age 8;02). Although these idiosyncratic systems vary from one another, we nevertheless find that all four children use handshape and movement devices productively to express cardinal and noncardinal number information, and that their number expressions are consistent in both form and meaning. Our study shows, for the first time, that all four homesigners not only incorporate number devices into representational devices used as predicates , but also into gestures functioning as nominals, including deictic gestures. In other words, the homesigners express number by systematically combining and re-combining additive markers for number (qua inflectional morphemes) with representational and deictic gestures (qua bases). The creation of new, complex forms with predictable meanings across gesture types and linguistic functions constitutes evidence for an inflectional morphological paradigm in homesign and expands our understanding of the structural patterns of language that are, and are not, dependent on linguistic input.

Overview of the dissertationThis dissertation comprises two extensive case studies in the morpho-syntactic structure and semantic interpretation of possessive (1) and nominalization (2) constructions in American Sign Language (ASL) using fieldwork data collected with native, deaf signers.(1) [ i bruno poss i book ] arrive ' A book of Bruno's arrived. ' y/n (2) ix 2 finish hear about [ vote-for. Nmz-Red ] 'Did you hear about the election?'In human language, possessives are tasked with encoding the relation between the possessor and possessee while nominalizations have the potential to import verbal predication structure to the nominal domain. Thus, the investigation of these topics in ASL broadens our typological and theoretical understanding of how relational meaning is established in nominal structures. Moreover, given the proposed verbal classification of poss (Study #1) and the morpho-semantic decomposition necessitated by nominalization patterns in the language (Study #2), the analyses developed also advance greatly our knowledge of verbal structure across languages, signed and spoken.