The aim of this paper is to analyze the pros and cons of the relationship between theories of grammar and psycholinguistic research conducted in laboratories. It is argued that current optimism about the benefits that psycholinguistic research may bring to those interested in the nature of language may be hard to reconcile with the difficulties there are in synchronising the research agendas of linguistics and psycholinguistics. The main appeal of psycholinguistic research lies in its superior testability standards. Through a brief examination of the simple notion of apposition, it is argued that linguistics is indeed irremediably circular and inconclusive, and that that is why some look to experimental research in language as a way ...