press. Dissociation of semantic and phonological errors in naming

We report the naming performance of a fluent aphasic, DP, who shows a striking dissociation between semantic and phonological (nonword) errors: he produced nu-merous semantic errors but virtually no phonological errors. DP’s pattern of perfor-mance is the reverse of that reported for patient DM (Caramazza, Papagno, & Ruml, 2000), who only made phonological errors in a naming task. These patterns of per-formance are inconsistent with the proposal by Dell, Schwartz, Martin, Saffran, and Gagnon (1997) that the naming deficit in fluent aphasia is the result of global damage to all levels of the lexical access system and support instead the hypothesis that brain damage can selectively disrupt distinct subcomponents of the lexical pro-cessing system. ª 2000 Academic Press Current models of lexical access share the core assumption that there are at least three distinct types of representations involved in speech production: semantic, lexical, and phonological (e.g., Caramazza, 1997; Dell, Schwartz