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Titolo:
Is there an anatomical basis for category-specificity? Semantic memory studies in PET and fMRI
Autore:
Devlin, JT; Russell, RP; Davis, MH; Price, CJ; Moss, HE; Fadili, MJ; Tyler, LK;
Indirizzi:
Univ Oxford, John Radcliffe Hosp, Ctr Funct Magnet Resonance Imaging Brain, Oxford OX3 9DU, England Univ Oxford Oxford England OX3 9DU maging Brain, Oxford OX3 9DU, England Univ Oxford, John Radcliffe Hosp, Dept Expt Psychol, Oxford OX3 9DU, England Univ Oxford Oxford England OX3 9DU Expt Psychol, Oxford OX3 9DU, England Univ Cambridge, Dept Expt Psychol, Cambridge CB2 3EB, England Univ Cambridge Cambridge England CB2 3EB hol, Cambridge CB2 3EB, England Univ Coll London, Wellcome Dept Congit Neurol, London WC1E 6BT, England Univ Coll London London England WC1E 6BT eurol, London WC1E 6BT, England
Titolo Testata:
NEUROPSYCHOLOGIA
fascicolo: 1, volume: 40, anno: 2002,
pagine: 54 - 75
SICI:
0028-3932(2002)40:1<54:ITAABF>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
POSITRON EMISSION TOMOGRAPHY; CEREBRAL BLOOD-FLOW; LIVING THINGS; DOUBLE DISSOCIATION; SELECTIVE DEFICIT; LEXICAL RETRIEVAL; NONLIVING THINGS; BRAIN ACTIVATION; TEMPORAL CORTEX; NEURAL SYSTEMS;
Keywords:
semantic memory; category specificity; PET; fMRI;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social & Behavioral Sciences
Life Sciences
Citazioni:
82
Recensione:
Indirizzi per estratti:
Indirizzo: Devlin, JT Univ Oxford, John Radcliffe Hosp, Ctr Funct Magnet Resonance Imaging Brain, Headley Way, Oxford OX3 9DU, England Univ Oxford Headley Way Oxford England OX3 9DU X3 9DU, England
Citazione:
J.T. Devlin et al., "Is there an anatomical basis for category-specificity? Semantic memory studies in PET and fMRI", NEUROPSYCHO, 40(1), 2002, pp. 54-75

Abstract

Patients with semantic impairments sometimes demonstrate category-specificdeficits suggesting that the anatomical substrates of semantic memory may reflect categorical organisation, however, neuroimaging studies have failedto provide consistent data in support of a category-based account. We conducted three functional neuroimaging experiments to investigate the neural correlates of semantic processing, two with positron emission tomography (PET) and a third with functional magnetic resonance imaging (fMRI). The firstexperiment used a lexical decision task to search for brain regions selectively activated by concepts from four different categories-animals, fruit, tools, and vehicles. The second experiment used a semantic categorisation task to increase the demands on the semantic system and to look for evidenceof consistent activations for the domains of natural kinds or man-made items. The final experiment was a replication of the semantic categorisation task using fMRI to increase the spatial resolution and statistical sensitivity of the experiment. The results of these experiments reliably identified a distributed neural system common to both natural kinds and artifacts but failed to find robust evidence of functional segregation by domain or categories. Category effects were neither reliable nor consistently present across experiments although sonic were consistent with previous studies. We discuss the implications of these findings, arguing that they are most consistent with a semantic system undifferentiated by category at the neural level. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/01/20 alle ore 19:13:01