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Titolo:
Magnetoencephalographic responses to painful impact stimulation
Autore:
Arendt-Nielsen, L; Yamasaki, H; Nielsen, J; Naka, D; Kakigi, R;
Indirizzi:
Univ Aalborg, Ctr Sensory Motor Interact, Lab Expt Pain Res, DK-9220 Aalborg, Denmark Univ Aalborg Aalborg Denmark DK-9220 Pain Res, DK-9220 Aalborg, Denmark Natl Inst Physiol Sci, Dept Integrat Physiol, Okazaki, Aichi 444, Japan Natl Inst Physiol Sci Okazaki Aichi Japan 444 , Okazaki, Aichi 444, Japan
Titolo Testata:
BRAIN RESEARCH
fascicolo: 1, volume: 839, anno: 1999,
pagine: 203 - 208
SICI:
0006-8993(19990821)839:1<203:MRTPIS>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
EVOKED MAGNETIC-FIELDS; CO2-LASER STIMULATION; CO2 STIMULATION; NASAL-MUCOSA; PATTERNS; SCALP;
Keywords:
experimental pain; human; impact stimulation; MEG; magnetoencephalography;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Arendt-Nielsen, L Univ Aalborg, Ctr Sensory Motor Interact, Lab Expt Pain Res, Fredrik Bajers Vej 7-D3, DK-9220 Aalborg, Denmark Univ Aalborg FredrikBajers Vej 7-D3 Aalborg Denmark DK-9220
Citazione:
L. Arendt-Nielsen et al., "Magnetoencephalographic responses to painful impact stimulation", BRAIN RES, 839(1), 1999, pp. 203-208

Abstract

Magnetoencephalographic (MEG) field recordings are unique to detect current dipoles in SI and SII. Few devices are available for painful mechanical stimulation in magnetically shielded MEG rooms. The aim of the present MEG (dual 37-channel biomagnetometer) study was to investigate the location of the cortical generators evoked by painful impact stimuli of different intensities. An airgun was placed outside the shielded MEG room, and small plastic bullets were fired at the arm and trunk of the subjects in the room. The velocity of the bullet was measured and related to the evoked pain intensity. Stimuli were delivered for each of the following three conditions: strong pain intensity elicited from the upper arm and upper trunk; weak pain intensity elicited from the upper trunk. The evoked MEG responses had a major component with the characteristically polarity-reversal deflections indicating a dipole located beneath the coils. The response could be estimated by a single current dipole. When the estimated locations of the dipoles were superimposed on the individual magnetic resonance images (MRIs), consistent bilateral activation of areas corresponding to the secondary sensory cortices (SII) was found. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

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Documento generato il 22/01/20 alle ore 09:42:29