Investigating word order processing using pupillometry and event related potentials In this thesis sentence processing was investigated using a psychophysiological measure known as pupillometry as well as Event Related Potentials (ERP). The scope of the the sis was broad investigating the processing of several different movement constructions with native speakers of English and second language learners of English as well as word order and case marking in German speaking adults and children. Pupillometry and ERP allowed us to test competing linguistic theories and use novel methodologies to investigate the processing of word order. In doing so we also aimed to establish pupillometry as an effective way to investigate the processing of word order thus broadening the methodological spectrum.