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Titolo:
ACTIVATION OF A DISTRIBUTED SOMATOSENSORY CORTICAL NETWORK IN THE HUMAN BRAIN - A DIPOLE MODELING STUDY OF MAGNETIC-FIELDS EVOKED BY MEDIANNERVE-STIMULATION .2. EFFECTS OF STIMULUS RATE, ATTENTION AND STIMULUS DETECTION
Autore:
MAUGUIERE F; MERLET I; FORSS N; VANNI S; JOUSMAKI V; ADELEINE P; HARI R;
Indirizzi:
HOP NEUROL,DEPT FUNCT NEUROL & EPILEPTOL F-69003 LYON FRANCE HELSINKI UNIV TECHNOL,LOW TEMP LAB,BRAIN RES UNIT FIN-02150 ESPOO FINLAND HCL,DEPT MED INFORMAT F-69003 LYON FRANCE
Titolo Testata:
Electroencephalography and clinical neurophysiology. Evoked potentials
fascicolo: 4, volume: 104, anno: 1997,
pagine: 290 - 295
SICI:
0168-5597(1997)104:4<290:AOADSC>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
SELECTIVE SPATIAL ATTENTION; CEREBRAL BLOOD-FLOW; PREFRONTAL CORTEX; SCALP TOPOGRAPHY; HEALTHY HUMANS; POTENTIALS; RESPONSES; RECORDINGS; INPUT; AREAS;
Keywords:
SOMATOSENSORY EVOKED FIELDS; MEG; SI AREA; SII AREA; POSTERIOR PARIETAL CORTEX; FRONTAL CORTEX; ATTENTION; STIMULUS DETECTION; HUMAN BRAIN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
40
Recensione:
Indirizzi per estratti:
Citazione:
F. Mauguiere et al., "ACTIVATION OF A DISTRIBUTED SOMATOSENSORY CORTICAL NETWORK IN THE HUMAN BRAIN - A DIPOLE MODELING STUDY OF MAGNETIC-FIELDS EVOKED BY MEDIANNERVE-STIMULATION .2. EFFECTS OF STIMULUS RATE, ATTENTION AND STIMULUS DETECTION", Electroencephalography and clinical neurophysiology. Evoked potentials, 104(4), 1997, pp. 290-295

Abstract

In this study we used a repeated measures design and univariate analysis of variance to study the respective effects of ISI, spatial attention and stimulus detection on the strengths of the sources previously identified by modelling SEFs during the 200 ms following mentally counted left median nerve stimuli delivered at long and random ISIs (Part I). We compared the SEF source strengths in response to frequent and rare stimuli, both in detection and ignoring conditions. This permittedus to establish a hierarchy in the effects of ISI, attention and stimulus detection on the activation of the cortical network of SEF sources distributed in SI and posterior parietal cortex contralateral to stimulation, and in the parietal operculum (SII) and premotor frontal cortex of both hemispheres. In all experimental conditions the SI and parietal opercular sources were the most active. All sources were more active in response to stimuli delivered at long and random ISIs and the frontal sources were activated only in this condition of stimulation. Driving the subject's attention toward the side stimulated had no detectable effect on the activity of SEF sources at short ISI. At long ISIs mental counting of the stimuli increased the responses of all sources except SI. These results suggest that activation of frontal sources during mental counting could reflect a working memory process, and that of posterior parietal sources a spatial attention effect detectable only at long ISIs. (C) 1997 Elsevier Science Ireland Ltd.

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Documento generato il 29/10/20 alle ore 21:32:50