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Titolo:
Coupling of regional activations in a human brain during an object and face affect recognition task
Autore:
Ioannides, AA; Liu, LC; Kwapien, J; Drozdz, S; Streit, M;
Indirizzi:
RIKEN, Brain Sci Inst, Lab Human Brain Dynam, Wako, Saitama 3510198, JapanRIKEN Wako Saitama Japan 3510198 rain Dynam, Wako, Saitama 3510198, Japan McMaster Univ, Dept Psychol, Hamilton, ON, Canada McMaster Univ Hamilton ON Canada niv, Dept Psychol, Hamilton, ON, Canada Inst Nucl Phys, Krakow, Poland Inst Nucl Phys Krakow PolandInst Nucl Phys, Krakow, Poland Univ Dusseldorf, Dept Psychiat, D-4000 Dusseldorf, Germany Univ Dusseldorf Dusseldorf Germany D-4000 at, D-4000 Dusseldorf, Germany
Titolo Testata:
HUMAN BRAIN MAPPING
fascicolo: 2, volume: 11, anno: 2000,
pagine: 77 - 92
SICI:
1065-9471(200010)11:2<77:CORAIA>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN EXTRASTRIATE CORTEX; SINGLE-TRIAL ANALYSIS; HUMAN AUDITORY-CORTEX; FACIAL EXPRESSIONS; MEG SIGNALS; EMOTION; INFORMATION; AMYGDALA;
Keywords:
visual object recognition; face recognition; facial emotion recognition; magnetoencephalography (MEG); magnetic field tomography (MFT); single trial analysis; mutual information (MI); time-dependent connectivity;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Ioannides, AA RIKEN, Brain Sci Inst, Lab Human Brain Dynam, 2-1 Hirosawa, Wako, Saitama 3510198, Japan RIKEN 2-1 Hirosawa Wako Saitama Japan 3510198 3510198, Japan
Citazione:
A.A. Ioannides et al., "Coupling of regional activations in a human brain during an object and face affect recognition task", HUM BRAIN M, 11(2), 2000, pp. 77-92

Abstract

Magnetic field tomography (MFT) was used to extract estimates for distributed source activity from average and single trial MEG signals recorded while subjects identified objects (including faces) and facial expressions of emotion. Regions of interest (ROIs) were automatically identified from the MET solutions of the average signal for each subject. For one subject the entire set of MFT estimates obtained from unaveraged data was also used to compute simultaneous time series for the single trial activity in different ROIs. Three pairs of homologous areas in each hemisphere were selected for further analysis: posterior calcarine sulcus (PCS), fusiform gyrus (FM), andthe amygdaloid complex (AM). Mutual information (MI) between each pair of the areas was computed from all single trial time series and contrasted fordifferent tasks (object or emotion recognition) and categories within eachtask. The MI analysis shows that through feed-forward and feedback linkages, the "computation" load associated with the task of identifying objects and emotions is spread across both space (different ROIs and hemispheres) and time (different latencies and delays in couplings between areas)-well within 200 ms, different objects separate first in the right hemisphere PCS and FG coupling while different emotions separate in the right hemisphere FG and AM coupling, particularly at latencies after 200 ms. (C) 2000 Wiley-Liss, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/03/20 alle ore 09:10:08