Kean, H., Fung, A., Jaggers, P., Chen, J., Rule, J. S., Benn, Y., Tenenbaum, J. B., Piantadosi, S. T., Varley, R. A., Fedorenko, E. (2026). Evidence from formal logical reasoning reveals that the language of thought is not natural language. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.2520095123