"Wait, how did you call this?": Speaker-specific word choices are stored and generalized.

It has been repeatedly shown that individuals track speaker-specific language use during interaction. Most studies focused on how this facilitates meaning inference when interspeaker variation differentiates between two or more alternatives, or how it allows for successful lexical alignment. However, it has been unclear whether mapping interspeaker variation is stored actively, and if so, what purposes this storage serves. In a pseudointeractive experiment, we created interspeaker variation in naming preferences, such that one speaker (the common speaker) consistently produced favored words, and the other speaker consistently produced less-favored/disfavored words (the uncommon speaker), across two conditions-one where both speakers were relatively common, and one where one of the speakers was highly uncommon. Participants engaged in a picture selection task, at first as matchers (where they were instructed by one of the speakers-each in his/her turn-which image to choose), and then as directors (where they were the instructors). They were then tested on how well they mapped interspeaker variation and how they generalized it linguistically and socially. Participants were successful at directly mapping interspeaker variation in naming preferences. Furthermore, they used this information in (a) lexically aligning with their interlocutors, (b) hypothesizing about unexposed word choices by these speakers, and (c) creating social representations of the speakers as individuals. In line with surprisal-driven learning accounts, these effects were larger for a speaker that used highly uncommon words. Our results suggest that individuals store interspeaker variation explicitly, which in turn helps them to predict their interlocutors' future linguistic and social behavior. (PsycInfo Database Record (c) 2025 APA, all rights reserved).