Much of the research on media and violence derives from the United States, particularly the related research fields of psychology and media/communication studies. Research in Europe and Australia on the relationship between media and violence is far broader and is much more clearly embedded in politics, culture and social relationships.[33] Jeff Lewis' book Media Culture and Human Violence challenges the conventional approaches to media violence research.[34] Lewis argues that violence is largely generated through the interaction of social processes and modes of thinking which are constantly refreshed through the media, politics and other cultural discourses. Violence is continually presented as 'authorised' or 'legitimate' within government, legal and narrative media texts.