“…Darley, Aronson, and Brown (1975) recognised pre-existing classifications byFroeschels (1943),Luchsinger and Arnold (1965),Brain (1965), andGrewel (1957), but pointed out that they were based on anatomy or that their categories were not internally consistent (i.e., had no unitary basis).3 This view of aphasia obviousl y is not universally accepted, but Darley was almost certainly partly motivated by his commitment to avoiding terminological confusion when communicating about the disorder, something that most aphasiologists would agree has been a chronic problem throughou t the history of study of aphasia.276 DUFFY AND KENT Downloaded by [UQ Library] at 21:25 03 November 2014…”