The document discusses psycholinguistic models of language production in bilinguals. It describes William Levelt's model which includes three components - the conceptualizer, formulator, and articulator. The conceptualizer involves thinking of concepts, the formulator translates concepts into words and sentences, and the articulator translates sentences into sounds. Recent research has examined language selection in bilingual production using tasks like picture naming and picture-word interference to study competition between a bilingual's two languages at the lemma level.