An emergent script is a writing system wholly invented from scratch by non-literates. The Vai script of Liberia is by far the longest lived and best documented of such scripts. Olena Tykhostup and I have recently aggregated and tabulated the history of this script for the Journal of Open Humanities Data.
(It’s not a fancy journal but I love the concept. There are scores of open data journals for the hard sciences but very few for the humanities and social sciences, meaning that our data becomes less visible, less citable, less accessible and ultimately less valuable.)
The paper explains how the data was evaluated and extracted, and what sources were included or excluded. It links directly to a Figshare repository where you can view or download it for yourself, including vector files. There are all kinds of practical and theoretical applications for this material and you can read about these in the paper. A teaser:
At present there is a growing interest in so-called emergent languages, such as the Nicaraguan and Bedouin Al-Sayyid sign languages [34, 35], and mixed languages like Light Walpiri  and Gurindji Kriol . Emergent sign languages have been developed ex nihilo by linguistic communities and are thus independent of any ‘parent’ languages and lineages. Mixed languages are also set apart because they involve a naturalistic re-engineering of existing linguistic structures to generate a new system. Since emergent languages (and to a lesser extent mixed languages) sit outside established language families, studies of these systems have the potential to reveal the spontaneous emergence of structure without the ‘noise’ of inheritance and contact. We contend that the Vai writing system has comparable value in tracing the evolution of graphic codes, a field of study that has so far been limited to laboratory settings.
The first preregistered study to draw on the evidence we have collected can be found here, and our analysis is nearing completion. Drop me a line if you want to know more, or watch this space.
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