My research covers four main themes in psycholinguistics: monitoring and control processes in language production, bilingualism, the production and acquisition of sentence structure, predictive processes during language comprehension. I use a diversity of research methods, such as behavioral experiments, analyses of speech errors and disfluencies, eye-tracking, EEG, patient studies, and computational modeling. Much of my earlier work viewed language as a static "given", without accounting for the fact that language is continuously in flux - both the language in general, and the language processing system during an individuals lifetime. I will therefore develop strands of research that focus on a) changes in language processing with ageing and b) changes in the language itself as a function of interactions among language users.