The last decades have seen major advances in the study of gestures both in humans and non-human primates. In this paper, we seriously examine the idea that there may be gestural form types that are shared across great ape species, including humans, which may underlie gestural universals, both in form and meaning. We focus on one case study, the hand fling gesture common to chimpanzees and humans, and provide a semantic analysis of this gesture.

Female crested gibbons (genus Nomascus) perform conspicuous sequences of twitching movements involving the rump and extremities. However, these dances have attracted little scientific attention and their structure and meaning remain largely obscure. Here we analyse close-range video recordings of captive crested gibbons, extracting descriptions of dance in four species (N. annamensis, N. gabriellae, N. leucogenys and N. siki). In addition, we report results from a survey amongst relevant professionals clarifying behavioural contexts of dance in captive and wild crested gibbons. Our (...) results demonstrate that dances in Nomascus represent a common and intentional form of visual communication restricted to sexually mature females. Whilst primarily used as a proceptive signal to solicit copulation, dances occur in a wide range of contexts related to arousal and/or frustration in captivity. A linguistically informed view of this sequential behaviour demonstrates that movement within dances is organized in groups and follows an isochronous rhythm — patterns not described for visual displays in other non-human primates. We argue that applying the concept of dance to gibbons allows us to expand our understanding of communication in non-human primates and to develop hypotheses on the rules and regularities characterising it. We propose that crested gibbon dances likely evolved from less elaborate rhythmic proceptive signals, similar to those found in siamangs. Although dance displays in humans and crested gibbons share a number of key characteristics, they cannot be assumed to be homologous. Nevertheless, gibbon dances represent a striking model behaviour to investigate the use of complex gestural signals in hominoid primates. (shrink)

Research in formal theoretical semantics has recently expanded its scope to include gestural communication, focusing in particular on gestures that contribute to the content of an accompanying utterance, e.g., size gestures (LARGE, WIDE), pointing gestures, and gestures that depict objects (TELESCOPE) or actions (SLAP). At the same time, fruitful inquiries at the intersection of primatology and linguistics have given rise to the hypothesis that human and non-human great apes share a common set of directive (=imperative) gestures. Directive gestures such as (...) STOP or COME-CLOSER, pose non-trivial issues for a semantic analysis: we inherit the challenges that pertain to the analysis of imperative utterances (Come closer!), while adding a further challenge that stems from the underspecified mapping between a directive body movement and its potential counterparts in human language. We begin by outlining the problem and surveying the nascent state-of-the-art with regards to a formal semantics of directive gestures. Particular attention is given to the multifunctionality of directive gestures, which typically have different effects in different contexts; for example, a non-human ape gesture may communicate "Stop that" in some contexts and "Move away" in others, with similar patterns found in humans. We show that this multifunctionality can be derived from a single, rich abstract lexical entry, "Not…!", a candidate for a universal building block of meaning, shared by human and non-human great apes. "Not…!", which incorporates negation/rejection, temporal reference and presuppositionality is more explanatory in comparison to a minimal alternative. This chapter lays out the hypothesis space, addressing the foundational question of how to explain attested gestural overlap between human and non-human great apes. We conclude the chapter by reviewing potential expansions of the analysis to the pragmatic gestures of humans, which are thus placed on the primate gestural meaning continuum and connected to the directive gestures we share with our non-human relatives in the great ape family. (shrink)

This paper pursues the idea that human and non-human great apes share a common set of directive (imperative) gestures and their meanings. We investigate gestures that are multifunctional, in that they have different effects in different contexts, focusing on non-human ape gestures that communicate “Stop that” in some contexts, and “Move away” in others. What may superficially appear to be lexical ambiguity can be derived from a single abstract lexical entry, “Not X!”, concluded to be a candidate for a universal (...) building block of meaning, shared by human and non-human great apes, reflections of which may also be found in the pragmatic gestures in humans. (shrink)