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Titolo:
The semantic interference effect in the picture-word paradigm: An event-related fMRI study employing overt responses
Autore:
de Zubicaray, GI; Wilson, SJ; McMahon, KL; Muthiah, S;
Indirizzi:
Univ Queensland, Ctr Magnet Resonance, Brisbane, Qld 4072, Australia Univ Queensland Brisbane Qld Australia 4072 Brisbane, Qld 4072, Australia
Titolo Testata:
HUMAN BRAIN MAPPING
fascicolo: 4, volume: 14, anno: 2001,
pagine: 218 - 227
SICI:
1065-9471(200112)14:4<218:TSIEIT>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPEECH PRODUCTION; LEXICAL ACCESS; SELECTIVE ATTENTION; ANTERIOR CINGULATE; FUNCTIONAL MRI; TIME-COURSE; TASK; ACTIVATION; MODELS; SET;
Keywords:
fMRI; semantic interference; word production; middle temporal gyrus; superior temporal gyrus; orbitomedial prefrontal cortex;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
53
Recensione:
Indirizzi per estratti:
Indirizzo: de Zubicaray, GI Univ Queensland, Ctr Magnet Resonance, Brisbane, Qld 4072, Australia Univ Queensland Brisbane Qld Australia 4072 2, Australia
Citazione:
G.I. de Zubicaray et al., "The semantic interference effect in the picture-word paradigm: An event-related fMRI study employing overt responses", HUM BRAIN M, 14(4), 2001, pp. 218-227

Abstract

We used event-related functional magnetic resonance imaging (fMRI) to investigate neural responses associated with the semantic interference (SI) effect in the picture-word task. Independent stage models of word production assume that the locus of the SI effect is at the conceptual processing level(Levelt et al. [1999]: Behav Brain Sci 22:1-75), whereas interactive models postulate that it occurs at phonological retrieval (Starreveld and La Heij [1996]: J Exp Psychol Learn Mem Cogn 22:896-918). In both types of model resolution of the SI effect occurs as a result of competitive, spreading activation without the involvement of inhibitory links. These assumptions were tested by randomly presenting participants with trials from semantically-related and lexical control distractor conditions and acquiring image volumes coincident with the estimated peak hemodynamic response for each trial. Overt vocalization of picture names occurred in the absence of scanner noise, allowing reaction time (RT) data to be collected. Analysis of the RT data confirmed the SI effect. Regions showing differential hemodynamic responses during the SI effect included the left mid section of the middle temporal gyrus, left posterior superior temporal gyrus, left anterior cingulate cortex, and bilateral orbitomedial prefrontal cortex. Additional responses were observed in the frontal eye fields, left inferior parietal lobule, and right anterior temporal and occipital cortex. The results are interpreted asindirectly supporting interactive models that allow spreading activation between both conceptual processing and phonological retrieval levels of wordproduction. In addition, the data confirm that selective attention/response suppression has a role in resolving the SI effect similar to the way in which Stroop interference is resolved. We conclude that neuroimaging studiescan provide information about the neuroanatomical organization of the lexical system that may prove useful for constraining theoretical models of word production. (C) 2001 Wiley-Liss, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/01/20 alle ore 19:01:53