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Titolo:
PAINFUL STIMULI EVOKE POTENTIALS RECORDED FROM THE PARASYLVIAN CORTEXIN HUMANS
Autore:
LENZ FA; RIOS M; CHAU D; KRAUSS GL; ZIRH TA; LESSER RP;
Indirizzi:
JOHNS HOPKINS UNIV HOSP,DEPT NEUROSURG,MEYER BLDG 7-113,600 N WOLFE ST BALTIMORE MD 21287 JOHNS HOPKINS UNIV HOSP,DEPT NEUROL BALTIMORE MD 21287
Titolo Testata:
Journal of neurophysiology
fascicolo: 4, volume: 80, anno: 1998,
pagine: 2077 - 2088
SICI:
0022-3077(1998)80:4<2077:PSEPRF>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
NOXIOUS THERMAL-STIMULATION; POSTERIOR LATERAL NUCLEUS; HUMAN CEREBRAL-CORTEX; CO2-LASER STIMULATION; ELECTRICAL-STIMULATION; NOCICEPTIVE RESPONSES; HEAT STIMULI; COGNITIVE COMPONENTS; CONDUCTION-VELOCITY; SOMATOSENSORY AREA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
100
Recensione:
Indirizzi per estratti:
Citazione:
F.A. Lenz et al., "PAINFUL STIMULI EVOKE POTENTIALS RECORDED FROM THE PARASYLVIAN CORTEXIN HUMANS", Journal of neurophysiology, 80(4), 1998, pp. 2077-2088

Abstract

Cutaneous stimulation of the face and hand with a CO, laser in three awake patients evoked potentials(LEPs) recorded from the dominant leftparasylvian cortex. These were recorded by means of a subdural grid of electrodes implanted for evaluation of epilepsy. Stimulation of the contralateral face resulted in waveforms consisting of a negative potential (N2, 162 +/- 5 ms; mean +/- SE) followed by a positive potential(P2, 340 +/- 18 ms). Both waves occurred at longer latency after handthan after facial stimulation. N2 and PZ potentials recorded from thegrid correspond well in morphology to those recorded from the scalp in four additional patients tested with the same stimulation paradigm. The N2 waves recorded from the subdural grid occurred at significantlyshorter latencies than did those recorded from the scalp (184 +/- 6 ms), but the P2 waves at the grid occurred at significantly longer latencies than did those recorded at the scalp (281 +/- 13 ms). The amplitudes of the potentials recorded from the grid were maximal over the parietal operculum both for contralateral stimulation of the face or hand and for ipsilateral stimulation of the face. Potentials also were recorded in this area after stimulation of the ipsilateral hand. The cortical distributions of these potentials suggest that their generators are located in the parietal operculum or in the insula, or in both, consistent with previous PET, magnetoencephalographic, and scalp LEP source analyses. These previous analyses provide indirect evidence of nociceptive input to parasylvian cortex because the interpretation of each analysis incorporates multiple assumptions. The present results are the first direct evidence of nociceptive input to the human parasylvian cortex.

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Documento generato il 06/04/20 alle ore 02:13:15