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Titolo:
Somatosensory evoked high-frequency oscillations recorded directly from the human cerebral cortex
Autore:
Maegaki, Y; Najm, I; Terada, K; Morris, HH; Bingaman, WE; Kohaya, N; Takenobu, A; Kadonaga, Y; Luders, HO;
Indirizzi:
Cleveland Clin Fdn, Dept Neurol, Cleveland, OH 44195 USA Cleveland Clin Fdn Cleveland OH USA 44195 Neurol, Cleveland, OH 44195 USA Cleveland Clin Fdn, Dept Neurosurg, Cleveland, OH 44195 USA Cleveland ClinFdn Cleveland OH USA 44195 rosurg, Cleveland, OH 44195 USA Tottori Univ, Fac Med, Inst Neurol Sci, Div Child Neurol, Yonago, Tottori 6838504, Japan Tottori Univ Yonago Tottori Japan 6838504 Yonago, Tottori 6838504, Japan Tottori Univ, Fac Med, Inst Neurol Sci, Div Neurosurg, Yonago, Tottori 6838504, Japan Tottori Univ Yonago Tottori Japan 6838504 Yonago, Tottori 6838504, Japan Kyoto Univ, Sch Med, Dept Brain Pathophysiol, Sakyo Ku, Kyoto 60601, JapanKyoto Univ Kyoto Japan 60601 Pathophysiol, Sakyo Ku, Kyoto 60601, Japan
Titolo Testata:
CLINICAL NEUROPHYSIOLOGY
fascicolo: 11, volume: 111, anno: 2000,
pagine: 1916 - 1926
SICI:
1388-2457(200011)111:11<1916:SEHORD>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEDIAN NERVE; SENSORIMOTOR CORTEX; POTENTIALS; LOCALIZATION; STIMULATION; MONKEY; TOPOGRAPHY; COMPONENTS; SCALP; NUCLEUS;
Keywords:
somatosensory evoked potential; high-frequency oscillation; subdural electrode; thalamocortical radiation; primary sensory cortex;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Maegaki, Y Cleveland Clin Fdn, Dept Neurol, 9500 Euclid Ave, Cleveland, OH44195 USA Cleveland Clin Fdn 9500 Euclid Ave Cleveland OH USA 44195 5 USA
Citazione:
Y. Maegaki et al., "Somatosensory evoked high-frequency oscillations recorded directly from the human cerebral cortex", CLIN NEU, 111(11), 2000, pp. 1916-1926

Abstract

Objective: To elucidate the generator sources of high-frequency oscillations of somatosensory evoked potentials (SEPs), we recorded somatosensory evoked high-frequency oscillations directly from the human cerebral cortex. Subjects and methods: Seven patients, 6 with intractable partial epilepsy and one with a brain tumor, were studied. With chronically implanted subdural electrodes, we recorded SEPs to median nerve stimulation in all patients, and also recorded SEPs to lip and posterior tibial nerve stimulation in one. High-frequency oscillations were recorded using a restricted bandpass filter (500-2000 Hz). Results: For the median nerve oscillations, all oscillation potentials were maximum at the electrodes closest to the primary hand sensorimotor area. Most oscillations were distributed similar to or more diffusely than P20/N20. Some later oscillations after the peak of P20 or N20 were present: in a very restricted cortical area similar to P25. We investigated the phase change of each oscillation potential around the central sulcus. One-third of the oscillations showed phase reversal around the central sulcus, while later oscillations elicited in a restricted cortical area did not. High-frequency oscillations to posterior tibial nerve and lip stimulation were also maximum in the sensorimotor areas. Most of the lip oscillations showed phase reversal around the central sulcus, but most of the posterior tibial nerve oscillations did not. Conclusion: High-frequency oscillations are generated near the primary sensorimotor area. There are at least two different generator mechanisms for the median nerve high-frequency oscillations. We suspect that most oscillations are derived from the terminal segments of thalamocortical radiations orfrom the primary sensorimotor cortex close to the generator of P20/N20, and some later oscillations from the superficial cortex close to the generator of P25. (C) 2000 Elsevier Science Ireland Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/03/20 alle ore 23:07:36