From natural to conventional word order: iconicity, simplicity and the mechanisms of linguistic evolution

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All languages have systematic structure, which allows us to communicate our thoughts. Where does this linguistic structure come from? Do the origins lie in the way humans think, or are the structures we find in languages the result of cultural processes like interaction and learning? There is increasing recognition that both individual and cultural processes play a role in the evolution of language, but it is not clear how these interact. We will provide new insights into these central questions of language evolution by conducting a series of laboratory experiments looking at the emergence of miniature artificial languages in the visual-gestural modality (artificial sign languages), comparing our results to data from naturally occurring sign languages, and extending our investigation to two other modalities: the graphical (using graphical icons) and the vocal (using iconic sounds).In the first strand, we start from improvisation: how do people convey information when they cannot use the languages they know? In experiments where participants convey information using only their body and no speech, we have found that they do not use the word order of their native language. Instead the order depends on the meaning being conveyed. We call this meaning-dependent pattern 'natural order': it represents preferences in individuals when they improvise one-off solutions to communication problems. Real languages are not one-off solutions to communication problems but instead have been used in interaction, and transmitted through learning over many generations. We will investigate what happens to natural word order (the result of improvisation) when it is learned by new individuals, and used in interaction. Natural word order can vary from meaning to meaning, however languages typically use a conventional order systematically across meanings. We hypothesise that this is due to a learning bias favouring simple systems. Accordingly, we will conduct artificial sign language learning experiments, to investigate whether word order in a system becomes more consistent when it is learned. Moreover, it is known that when individuals interact, structural priming occurs: individuals are likely to repeat structures that have just occurred in conversation. In an improvised gesture study that implements communicative interaction, we will investigate how word order variability is affected by priming. These experiments together will uncover how learning and interaction contribute to the process that takes us from improvised utterances to a linguistic system. Conducting laboratory experiments allows us to study learning and interaction in detail in a controlled setting. However, pairing laboratory work with an investigation of the same phenomena in a naturalistic context would broaden the empirical basis of our findings. Using the gestural modality in the lab allows us to build a bridge between experimental work and the study of existing sign languages. In the second strand of the project we will examine word order in British and German Sign Language in order to see how preferences for naturalness and simplicity are shaped by learning and interaction, in large populations, over longer periods of time.Lastly, in a suite of innovative experiments, we will compare improvised gesture to the graphical modality (where participants manipulate iconic signs) and the vocal modality (where participants produce sounds, but not words, to convey information). Looking at improvisation in these different modalities will allow us to test the generality of our previous results from gesture experiments, and discover the affordances of different modalities with respect to iconicity (resemblance-based mappings between form and meaning). Together, our multi-modal experiments and sign language studies will provide a new way to look at the mechanisms that create structured languages.