In dialogue, speakers tend to converge on the words they use. Dialogue thus constitutes an ideal setting to integrate new words and new uses for known words into long-term memory. However, it is unknown whether imitative behaviours occurring during dialogue may be the source of changing in linguistic representations after dialogue. Using electrophysiological and behavioural measures, the project will address whether and how the interaction between a native speaker and a non-native speaker changes linguistic representations at phonological and lexical levels, leading to improvements in speech perception and production.