The issue of how inflection morphology is to be adequately dealt with in theoretical terms and how inflected words are to be represented has triggered almost unparalleled controversy both in theoretical linguistics and in psycho/neurolinguistics and the cognitive sciences in general. The aim of this study is to integrate morphological theories and psycho- and neurolinguistic findings to form an overall picture of the mental and neuronal representation of inflection. As such it contributes to our understanding of inflection as a grammatical operation located in the brain.