I am a faculty member in computer and cognitive sciences at the University of Toronto. My research explores the intersection of language, cognition, and computation.
Natural language utilizes a finite vocabulary to express an infinite array of ideas. I investigate how we adapt the lexicon to convey emerging meanings and whether the underlying cognitive processes can be understood in computational terms. I am particularly interested in the problems of semantic change and how words acquire new meanings---over history or in child development, and the extent to which computational models can replicate these processes to construct and interpret novel word meanings.
In a related line of work, I have been involved in projects that examine crosslinguistic structures. I also develop computational tools for exploring the relations of language with other domains such as morality.
Lexicon development and evolution
- Yu, L. and Xu, Y. (2025) Infinite mixture chaining: An efficiency-based framework for the dynamic construction of word meaning. Open Mind, 9, 1-24.
- Xu, A., Kemp, C., Frermann, L., and Xu, Y. (2024) Word reuse and combination support efficient communication of emerging concepts. PNAS, 121(46), e2406971121.
- Brochhagen, T., Boleda, G., Gualdoni, E., and Xu, Y. (2023) From language development to language evolution: A unified view of human lexical creativity. Science, 381(6656), 431-436.
- Xu, A., Stellar, J.E., and Xu, Y. (2021) Evolution of emotion semantics. Cognition, 217, 104875.
- Sun, Z., Zemel, R., and Xu, Y. (2021) A computational framework for slang generation. TACL, 9, 462-478.
- Ferreira Pinto Jr., R. and Xu, Y. (2021) A computational theory of child overextension. Cognition, 206, 104472.
- Habibi, A.A., Kemp, C., and Xu, Y. (2020) Chaining and the growth of linguistic categories. Cognition, 202, 104323.
- Ramiro, C., Srinivasan, M., Malt, B.C., and Xu, Y. (2018) Algorithms in the historical emergence of word senses. PNAS, 115(10), 2323-2328.
- Xu, Y., Malt, B.C. and Srinivasan, M. (2017) Evolution of word meanings through metaphorical mapping: Systematicity over the past millennium. Cognitive Psychology, 96, 41-53.
- Xu, Y., Regier, T. and Malt, B.C. (2016) Historical semantic chaining and efficient communication: The case of container names. Cognitive Science, 40(8):2081-2094.
Crosslinguistic structures
- Fugikawa, O., Hayman, O., Liu, R., Yu, L., Brochhagen, T., and Xu, Y. (2023) A computational analysis of crosslinguistic regularity in semantic change. Frontiers in Communication, 8:1136338.
- Hahn, M. and Xu, Y. (2022) Crosslinguistic word order variation reflects evolutionary pressures of dependency and information locality. PNAS, 119(24), e2122604119.
- Xu, Y., Duong, K., Malt, B.C., Jiang, S., and Srinivasan, M. (2020) Conceptual relations predict colexification across languages. Cognition, 201, 104280.
- Xu, Y., Liu, E., and Regier, T. (2020) Numeral systems across languages support efficient communication: From approximate numerosity to recursion. Open Mind, 4, 57-70.
- Kemp, C., Xu, Y., and Regier, T. (2018) Semantic typology and efficient communication. Annual Review of Linguistics, 4:109-128.
- Ramezani, A., Liu, E., Lee, S.W.S., and Xu, Y. (2024) Quantifying the emergence of moral foundational lexicon in child language development. PNAS Nexus, 3(8), 278.
- Ramezani, A. and Xu, Y. (2023) Knowledge of cultural moral norms in large language models. In ACL.
- Xie, J.Y., Ferreira Pinto Jr., R., Hirst, G., and Xu, Y. (2019) Text-based inference of moral sentiment change. In EMNLP-IJCNLP, 4654-4663, Hong Kong, China.
