ABSTRACT
One of the primary characteristics of agrammatism is impaired production (and sometimes comprehension) of grammatical morphology or functional categories, which affects both bound grammatical morphemes and freestanding function words. On most accounts, agrammatism is associated with relatively preserved derivational morphology (Caramazza & Miceli 1989; Faroqi-Shah & Thompson 2004; Miceli & Caramazza 1988), although there are exceptions to this (see Fix, Dickey, & Thompson 2005; Kohn & Melvold 2000; Mathews & Obler 1997; also see Luzzatti, Mondini, & Semenza, this volume). This chapter addresses patterns of impaired functional categories in agrammatism and discusses theories that attempt to determine the source of such deficits.
