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Titolo:
Dipolar source modeling of somatosensory evoked potentials to painful and nonpainful median nerve stimulation
Autore:
Valeriani, M; Le Pera, D; Niddam, D; Arendt-Nielsen, L; Chen, ACN;
Indirizzi:
Univ Cattolica Sacro Cuore, Dept Neurol, I-00168 Rome, Italy Univ Cattolica Sacro Cuore Rome Italy I-00168 eurol, I-00168 Rome, Italy Univ Aalborg, Ctr Sensory Motor Interact, Lab Expt Pain Res, Aalborg, Denmark Univ Aalborg Aalborg Denmark eract, Lab Expt Pain Res, Aalborg, Denmark
Titolo Testata:
MUSCLE & NERVE
fascicolo: 8, volume: 23, anno: 2000,
pagine: 1194 - 1203
SICI:
0148-639X(200008)23:8<1194:DSMOSE>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRICAL SOURCE ANALYSIS; MAGNETIC-FIELDS; HUMAN BRAIN; CO2-LASER STIMULATION; SCALP TOPOGRAPHY; HEAT STIMULI; CORTEX; LOCALIZATION; RESPONSES; PERCEPTION;
Keywords:
dipolar source modeling; pain; SI area; SII area; somatosensory evoked potentials;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
66
Recensione:
Indirizzi per estratti:
Indirizzo: Valeriani, M Univ Cattolica Sacro Cuore, Dept Neurol, Lgo A Gemelli 8, I-00168 Rome, Italy Univ Cattolica Sacro Cuore Lgo A Gemelli 8 Rome Italy I-00168
Citazione:
M. Valeriani et al., "Dipolar source modeling of somatosensory evoked potentials to painful and nonpainful median nerve stimulation", MUSCLE NERV, 23(8), 2000, pp. 1194-1203

Abstract

Dipolar source modeling might help in clarifying whether somatosensory evoked potentials (SEPs) after electrical stimulation at painful intensity contain any information related to the nociceptive processing. SEPs were recorded after left median nerve stimulation at three different intensities: intense but nonpainful (intensity 2); slightly painful (pain threshold; intensity 4); and moderately painful (intensity 6), Scalp SEPs at intensities 2, 4, and 6 were fitted by a five-dipole model. When the strength modifications of the source activities up to 40 ms were examined across the different stimulus intensities, no significant difference was found. In the later epoch (40-200 ms), a posterior parietal dipole and two bilateral sources probably located in the second somatosensory (SII) areas increased significantly their dipole moments when the stimulus was increased from 2 to 4 and becamepainful. Since no difference was found when the stimulus intensity was increased from 4 to 6, the observed increase of the dipolar strengths is probably related to a variation of the stimulus quality (nonpainful vs, painful), rather than of the stimulus intensity per se. Our findings lead us to conclude that a large convergence of nociceptive and non-nociceptive afferentsprobably occurs bilaterally in the SII areas, (C) 2000 John Wiley & Sons, Inc.

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Documento generato il 31/03/20 alle ore 22:34:02