Research Groups: Friday, October 9

10:00 AM - 11:30 AM: Psycholinguistics Group
Guest speaker: Jiangtian Li (University of Western Ontario): "On polysemy: a philosophical, psycholinguistic, computational approach."

Most words in natural languages are polysemous, that is they have related but different meanings in different contexts. These polysemous meanings (senses) are marked by their structuredness, flexibility, productivity, and regularity. Previous theories have focused on some of these features but not all of them together. Thus, I propose a new theory of polysemy, which has two components. First, word meaning is actively modulated by broad contexts in a continuous fashion. Second, clustering arises from contextual modulations of a word and is then entrenched in our long term memory to facilitate future production and processing. Hence, polysemous senses are entrenched clusters in contextual modulation of word meaning and a word is polysemous if and only if it has entrenched clustering in its contextual modulation. I argue that this theory explains all the features of polysemous senses. In order to demonstrate more thoroughly how clusters emerge from meaning modulation during processing and provide evidence for this new theory, I implement the theory by training a recurrent neural network (RNN) that learns distributional information through exposure to a large corpus of English. Clusters of contextually modulated meanings emerge from how the model processes individual words in sentences. This trained model is validated against a human-annotated corpus of polysemy, focusing on the gradedness and flexibility of polysemous sense individuation, a human-annotated corpus of regular polysemy, focusing on the regularity of polysemy, and behavioral findings of offline sense relatedness ratings and online sentence processing. Last, the implication to philosophy of this new theory of polysemy is discussed. I focus on the debate between semantic minimalism and semantic contextualism. I argue that the phenomenon of polysemy poses a severe challenge to semantic minimalism. No solution is foreseeable if the minimalist thesis is kept, and the existence of contextual modulation is denied within the literal truth condition of an utterance.

1:00 PM - 2:30 PM: Semantics Research Group
Guillaume Thomas (faculty) presenting on collaborative work with language consultant Germino Duarte: "Switch-Reference: Syntax and/or (discourse) semantics?"