Structuring unleashed expression: developmental foundations of human communication

*** This paper has now been published at Behavioral and Brain Sciences, please cite the published version: Rorot, W., Skowrońska, K., Nagórska, E., Zieliński, K., Zubek, J., & Rączaszek-Leonardi, J. (2023). Structuring unleashed expression: Developmental foundations of human communication. Behavioral and Brain Sciences, 46, E13. doi:10.1017/S0140525X22000838 *** The target article highlights the sources of open-endedness of human communication. However, the authors’ perspective does not account for the structure of particular communication systems. To this end, we extend the authors’ perspective, in the spirit of Evolutionary Extended Synthesis, with a detailed account of the sources of constraints imposed upon expression in the course of child development.