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Titolo:
Repeating without semantics: Surface dysphasia?
Autore:
McCarthy, RA; Warrington, EK;
Indirizzi:
Univ Cambridge, Dept Expt Psychol, Cambridge CB2 3EB, England Univ Cambridge Cambridge England CB2 3EB hol, Cambridge CB2 3EB, England Inst Neurol, Dept Clin Neurol, Dementia Res Grp, London WC1N 3BG, England Inst Neurol London England WC1N 3BG ia Res Grp, London WC1N 3BG, England
Titolo Testata:
NEUROCASE
fascicolo: 1, volume: 7, anno: 2001,
pagine: 77 - 87
SICI:
1355-4794(2001)7:1<77:RWSSD>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
SHORT-TERM-MEMORY; DEMENTIA; APHASIA; IMPAIRMENT; DYSLEXIA; IMPACT;
Keywords:
semantic dementia; phonological representations; word list and sentence repetition; word frequency; syntactic and morphological representation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: McCarthy, RA Univ Cambridge, Dept Expt Psychol, Downing Site,Downing St, Cambridge CB2 3EB, England Univ Cambridge Downing Site,Downing St CambridgeEngland CB2 3EB
Citazione:
R.A. McCarthy e E.K. Warrington, "Repeating without semantics: Surface dysphasia?", NEUROCASE, 7(1), 2001, pp. 77-87

Abstract

We describe our investigations of MNA, who had a progressive, severe and global loss of semantic knowledge (semantic dementia), Her verbal vocabularywas restricted to a few common words and she was also unable to recognize common objects from sight, By contrast, she had a well-preserved digit span(7-8 digits). In this series of experiments, we focused on her ability to repeat lists and sentences in which familiarity, meaningfulness, morphologyand syntactic structure were manipulated. In list repetition tasks, we found that MNA showed a reliable effect of phonological similarity, word frequency and stimulus lexicality, but was unaffected by linguistic complexity, word length, semantic coherence or the status of individual stimuli as 'known' or 'unknown'. In sentence repetition, her performance was not influenced by any semantic variables. However, there was a substantial effect of thefrequency of the constituent vocabulary, even for words outside the range of her retained vocabulary. The influence of syntax was restricted to minoreffects of morphology, The phonemes of syllables and the syllables of words are bound by their co-occurrence rather than their meaning. We conclude that the phonological representation of words is functionally independent ofthe semantic system.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 16:22:37