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Updated: Jan 22, 2026

Author Spotlight: Deciphering the Cognitive and Neural Mechanisms of Gesture in Communication
Published on: January 26, 2024
Evolving artificial sign languages in the lab: From improvised gesture to systematic sign
Yasamin Motamedi1, Marieke Schouwstra2, Kenny Smith2
1Department of Experimental Psychology, University College London, 26 Bedford Way, London WC1H 0AP, UK; Centre for Language Evolution, University of Edinburgh, 3 Charles Street, Edinburgh EH3 9AD, UK.
Abstract:
Recent work on emerging sign languages provides evidence for how key properties of linguistic systems are created. Here we use laboratory experiments to investigate the contribution of two specific mechanisms-interaction and transmission-to the emergence of a manual communication system in silent gesturers. We show that the combined effects of these mechanisms, rather than either alone, maintain communicative efficiency, and lead to a gradual increase of regularity and systematic structure. The gestures initially produced by participants are unsystematic and resemble pantomime, but come to develop key language-like properties similar to those documented in newly emerging sign systems.
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