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Additional Information

Competing Interests

The authors declare that they have no competing interests. Andrea Ravignani is a Marie Curie guest scientist, not an employee, of Sealcentre Pieterburen.

Author Contributions

Andrea Ravignani wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Tessa Verhoef wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Data Deposition

The following information was supplied regarding data availability:

The research in this article did not generate any data or code (as this is a commentary).


This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 665501 with the research Foundation Flanders (FWO) (Pegasus2 Marie Curie fellowship 12N5517N awarded to AR), a visiting fellowship in Language Evolution from the Max Planck Society (awarded to AR), ERC grant 283435 ABACUS (awarded to Bart de Boer), and NWO Veni grant 275-89-031 (awarded to TV). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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