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There has been a debate over how a word’s syntactic class is represented in the mind. One model claims that information is represented solely at the semantic level while another account holds that syntactic class information could be represented both at a semantic and an independent lexical level. Two aphasic participants with a significant advantage for naming verbs in comparison to nouns took part in the investigation. They were assessed with several picture naming tests, two comprehension tests as well as an object naming test comparing animate and inanimate objects. In one participant, the pronounced deficit for nouns resulted from a semantic impairment: there was a comparable dissociation in comprehension of words, a nonverbal semantic deficit, and performance was mainly affected by semantic variables (imageability; animacy). In the other participant, the difference between nouns and verbs arose from a lexical impairment since no comparable comprehension deficit was observed. In addition, performance was affected, mainly, by lexical variables (word frequency). Results from one participant suggest a semantic locus of noun–verb differences and provide empirical support for a specific model of objects’ and actions’ semantic representations. In contrast, the other participant’s performance strongly suggests the word class effect to arise from a lexical impairment. Thus, the study provides support for two independent loci of noun–verb differences thereby contradicting one account’s strong claim that noun–verb differences arise solely from semantic impairments. The results also speak against recent cognitive accounts rejecting the idea of independent lexical representations.

Information about word class is both semantically and lexically represented: evidence from an advantage for verbs in two speakers with aphasia