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Titolo:
Explicit and implicit neural mechanisms for processing of social information from facial expressions: A functional magnetic resonance imaging study
Autore:
Critchley, H; Daly, E; Phillips, M; Brammer, M; Bullmore, E; Williams, S; Van Amelsvoort, T; Robertson, D; David, A; Murphy, D;
Indirizzi:
Inst Psychiat, Dept Psychol Med, London SE5 8AF, England Inst Psychiat London England SE5 8AF sychol Med, London SE5 8AF, England Inst Psychiat, Dept Biostat, London, England Inst Psychiat London England st Psychiat, Dept Biostat, London, England Inst Psychiat, Dept Neuroimaging, London, England Inst Psychiat London England ychiat, Dept Neuroimaging, London, England
Titolo Testata:
HUMAN BRAIN MAPPING
fascicolo: 2, volume: 9, anno: 2000,
pagine: 93 - 105
SICI:
1065-9471(200002)9:2<93:EAINMF>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
PRIMATE ORBITOFRONTAL CORTEX; HUMAN EXTRASTRIATE CORTEX; FRONTAL-LOBE DAMAGE; TEMPORAL CORTEX; HUMAN AMYGDALA; VISUAL-CORTEX; FACE; ACTIVATION; RESPONSES; FMRI;
Keywords:
amygdala; conscious perception; emotion; extrastriate cortex; fusiform; hippocampus; middle temporal gyrus;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
67
Recensione:
Indirizzi per estratti:
Indirizzo: Murphy, D Inst Psychiat, Dept Psychol Med, DeCrespigny Pk,Denmark Hill, London SE5 8AF, England Inst Psychiat DeCrespigny Pk,Denmark Hill London England SE5 8AF
Citazione:
H. Critchley et al., "Explicit and implicit neural mechanisms for processing of social information from facial expressions: A functional magnetic resonance imaging study", HUM BRAIN M, 9(2), 2000, pp. 93-105

Abstract

The processing of changing nonverbal social signals such as facial expressions is poorly understood, and it is unknown if different pathways are activated during effortful (explicit), compared to implicit, processing of facial expressions. Thus we used fMRI to determine which brain areas subserve processing of high-valence expressions and if distinct brain areas are activated when facial expressions are processed explicitly or implicitly. Nine healthy volunteers were scanned (1.5T GE Signa with ANMR, TE/TR 40/3,000 ms)during two similar experiments in which blocks of mixed happy and angry facial expressions ("on" condition) were alternated with blocks of neutral faces (control "off" condition). Experiment 1 examined explicit processing ofexpressions by requiring subjects to attend to, and judge, facial expression. Experiment 2 examined implicit processing of expressions by requiring subjects to attend to, and judge, facial gender, which was counterbalanced in both experimental conditions. Processing of facial expressions significantly increased regional blood oxygenation level-dependent (BOLD) activity infusiform and middle temporal gyri, hippocampus, amygdalohippocampal junction, and pulvinar nucleus. Explicit processing evoked significantly more activity in temporal lobe cortex than implicit processing, whereas implicit processing evoked significantly greater activity in amygdala region. Mixed high-valence facial expressions are processed within temporal lobe visual cortex, thalamus, and amygdalohippocampal complex. Also, neural substrates forexplicit and implicit processing of facial expressions are dissociable: explicit processing activates temporal lobe cortex, whereas implicit processing activates amygdala region. Our findings confirm a neuroanatomical dissociation between conscious and unconscious processing of emotional information. Hum. Brain Mapping 9:93-105, 2000. (C) 2000 Wiley-Liss, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/08/20 alle ore 05:33:30