Prototype theory and emotion semantic change Aotao Xu (
[email protected]) Department of Computer Science, University of Toronto Jennifer Stellar (
[email protected]) Department of Psychology, University of Toronto Yang Xu (
[email protected]) Department of Computer Science, Cognitive Science Program, University of Toronto Abstract provided evidence for this prototype view using a variety An elaborate repertoire of emotions is one feature that dis- of stimuli ranging from emotion words (Storm & Storm, tinguishes humans from animals. Language offers a critical 1987), videos (Cowen & Keltner, 2017), and facial expres- form of emotion expression. However, it is unclear whether sions (Russell & Bullock, 1986; Ekman, 1992). Prototype the meaning of an emotion word remains stable, and what fac- tors may underlie changes in emotion meaning. We hypothe- theory provides a synchronic account of the mental represen- size that emotion word meanings have changed over time and tation of emotion terms, but how this view extends or relates that the prototypicality of an emotion term drives this change to the diachronic development of emotion words is an open beyond general factors such as word frequency. We develop a vector-space representation of emotion and show that this problem that forms the basis of our inquiry. model replicates empirical findings on prototypicality judg- ments and basic categories of emotion. We provide evidence Theories of semantic change that more prototypical emotion words have undergone less change in meaning than peripheral emotion words over the past Our work also draws on an independent line of research in century, and that this trend holds within each family of emo- historical semantic change.