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Titolo:
Source dipole analysis of the early components of the RREP
Autore:
Logie, ST; Colrain, IM; Webster, KE;
Indirizzi:
Univ Melbourne, Dept Psychol, Parkville, Vic 3052, Australia Univ Melbourne Parkville Vic Australia 3052 arkville, Vic 3052, Australia
Titolo Testata:
BRAIN TOPOGRAPHY
fascicolo: 2, volume: 11, anno: 1998,
pagine: 153 - 164
SICI:
0896-0267(199824)11:2<153:SDAOTE>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOMATOSENSORY-EVOKED-POTENTIALS; SHORT-LATENCY COMPONENTS; INSPIRATORY OCCLUSION; SENSORIMOTOR CORTEX; FINGER STIMULATION; CEREBRAL-CORTEX; MEDIAN NERVE; N20; P22; LOCALIZATION;
Keywords:
RREP; localisation; EEG; evoked potential; respiration;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
42
Recensione:
Indirizzi per estratti:
Indirizzo: Colrain, IM Univ Melbourne, Dept Psychol, Parkville, Vic 3052, Australia Univ Melbourne Parkville Vic Australia 3052 c 3052, Australia
Citazione:
S.T. Logie et al., "Source dipole analysis of the early components of the RREP", BRAIN TOPOG, 11(2), 1998, pp. 153-164

Abstract

Occlusion of the inspiratory airway produces a series of early RREP components. The predominant early positive and negative peaks are seen over the parietal and frontal scalp respectively and have been hypothesised to represent parallel activation of somatosensory and motor cortices in a manner similar to electrically produced SEP components. An alternative hypothesis is that both components are produced by somatosensory cortex, with the frontally maximal negativity reflecting the activity of a tangential dipole source. Respiratory-related evoked potentials (RREPs) elicited by brief occlusionof the inspiratory airway, were recorded using 29 scalp electrodes from six subjects. Early latency components were analysed using the Electromagnetic Source Estimation (EMSE) program for modelling equivalent electrical dipoles, in order to suggest likely generator sources. Two hypotheses were tested: first, that radial dipoles generated by both pre- (motor cortex) and post-centrally (somatosensory cortex) produce the early components; and second, that generator sources are limited to the somatosensory cortex, with activity recorded as frontally maximal reflecting volume conduction from tangential dipoles. Results were highly consistent between subjects and suggested that Nf-P1 was best accounted for by two post-central and two pre-centralradial dipoles supporting the first hypothesis. Locations of generator sources are discussed in relation to anatomical correlates.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/01/21 alle ore 01:28:54