Background: Although disproportionate impairment of noun or verb retrieval has been described on the basis of the evidence from several aphasic cases since the mid 1980s, with different theoretical frames being proposed to account for noun-verb dissociation, very few studies have dealt with this dissociation in spontaneous speech. Aims: The objectives of this study were to investigate (i) whether the dissociation also emerged in connected speech, and (ii) whether the analysis of patients' narratives could shed light on the functional damage underlying their grammatical-class-specific impairment. Methods & Procedures: Two non-fluent verb-impaired patients, two fluent verbimpaired patients, and three fluent noun-impaired patients participated in this study. Their noun-verb dissociation was preliminarily assessed through a picture-naming task, following which their spontaneous speech was collected and analysed using a single-case approach, taking into consideration both lexical productivity (as indicated by the number of different tokens produced by the patients) and lexical diversity (as indicated by the number of different types and stems used by the patients). Outcomes & Results: Non-fluent verb-impaired patients tended to produce a lower proportion of verb types than unimpaired control participants, as opposed to fluent verb-impaired patients, who produced a normal verb rate in their spontaneous speech on all counting procedures. One out of three fluent noun-impaired patients produced a lower proportion of noun tokens, types, and stems compared to normal speakers. Conclusions: The data presented in this paper indicate that noun-verb dissociation as assessed in picture-naming tasks might not emerge in spontaneous speech and indicates the need for the inclusion of a lemma level in models of word production that aims at explaining grammatical-class-specific impairments in people with aphasia

Crepaldi, D., Ingignoli, C., Verga, R., Contardi, A., Semenza, C., Luzzatti, C. (2011). On nouns, verbs, lexemes and lemmas: Evidence from the spontaneous speech of seven aphasic patients. APHASIOLOGY, 25(1), 71-92 [10.1080/02687031003637114].

On nouns, verbs, lexemes and lemmas: Evidence from the spontaneous speech of seven aphasic patients

CREPALDI, DAVIDE;LUZZATTI, CLAUDIO GIUSEPPE
2011

Abstract

Background: Although disproportionate impairment of noun or verb retrieval has been described on the basis of the evidence from several aphasic cases since the mid 1980s, with different theoretical frames being proposed to account for noun-verb dissociation, very few studies have dealt with this dissociation in spontaneous speech. Aims: The objectives of this study were to investigate (i) whether the dissociation also emerged in connected speech, and (ii) whether the analysis of patients' narratives could shed light on the functional damage underlying their grammatical-class-specific impairment. Methods & Procedures: Two non-fluent verb-impaired patients, two fluent verbimpaired patients, and three fluent noun-impaired patients participated in this study. Their noun-verb dissociation was preliminarily assessed through a picture-naming task, following which their spontaneous speech was collected and analysed using a single-case approach, taking into consideration both lexical productivity (as indicated by the number of different tokens produced by the patients) and lexical diversity (as indicated by the number of different types and stems used by the patients). Outcomes & Results: Non-fluent verb-impaired patients tended to produce a lower proportion of verb types than unimpaired control participants, as opposed to fluent verb-impaired patients, who produced a normal verb rate in their spontaneous speech on all counting procedures. One out of three fluent noun-impaired patients produced a lower proportion of noun tokens, types, and stems compared to normal speakers. Conclusions: The data presented in this paper indicate that noun-verb dissociation as assessed in picture-naming tasks might not emerge in spontaneous speech and indicates the need for the inclusion of a lemma level in models of word production that aims at explaining grammatical-class-specific impairments in people with aphasia
Articolo in rivista - Articolo scientifico
Grammatical class, Noun–verb dissociation, Spontaneous speech, Lexical diversity, Type, Token, Stem, Lemma, Lexeme
English
14-gen-2011
2011
25
1
71
92
open
Crepaldi, D., Ingignoli, C., Verga, R., Contardi, A., Semenza, C., Luzzatti, C. (2011). On nouns, verbs, lexemes and lemmas: Evidence from the spontaneous speech of seven aphasic patients. APHASIOLOGY, 25(1), 71-92 [10.1080/02687031003637114].
File in questo prodotto:
File Dimensione Formato  
Crepaldi-2011-Aphasiology-AAM.pdf

accesso aperto

Descrizione: Article
Tipologia di allegato: Author’s Accepted Manuscript, AAM (Post-print)
Dimensione 533.24 kB
Formato Adobe PDF
533.24 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/9786
Citazioni
  • Scopus 27
  • ???jsp.display-item.citation.isi??? 24
Social impact