Syntactic adaptation depends on perceived linguistic knowledge: Native English speakers differentially adapt to native and non-native confederates in dialogue
The way speakers adapt their language during interaction may be influenced by their perception of their partner’s linguistic knowledge. We examined the degree to which speakers adapt to the syntactic structures used by their interlocutor, comparing interaction between native speakers of English and a partner who was a native or a nonnative speaker. In three lab-based experiments, naive participants took turns to describe and match pictures with a confederate who was a native or nonnative speaker of English. We found that participants tended to produce the same syntactic form (prepositional object or double object) that the confederate had just produced on the turn before. We observed different levels of adaptation to native and nonnative confederates, with participants adapting more to nonnative confederates than native confederates, but only when confederates exhibited linguistic inflexibility through a rigid production of double object constructions, some of which were ungrammatical (e.g. “The wizard donates the golfer the cake”). A further two online experiments were conducted to replicate the design of the lab-based experiments. We found differential adaptation to natives and nonnatives again only when confederates’ behaviour exhibited the same linguistic inflexibility; however, the effect of confederate nativeness was the opposite to the lab experiments, with participants adapting more to the inflexible native speaker. Together, our results provide evidence that adaptation is at least partly driven by listener-oriented mechanisms; speakers take into account their partner’s linguistic knowledge and communicative needs when these needs are foregrounded by the communicative context.