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Titolo:
Independent short-term variability of spike-like (600 Hz) and postsynaptic(N20) cerebral SEP components
Autore:
Klostermann, F; Nolte, G; Curio, G;
Indirizzi:
Free Univ Berlin, Klinikum Benjamin Franklin, Dept Neurol, Neurophys Grp, D-12200 Berlin, Germany Free Univ Berlin Berlin Germany D-12200 hys Grp, D-12200 Berlin, Germany
Titolo Testata:
NEUROREPORT
fascicolo: 2, volume: 12, anno: 2001,
pagine: 349 - 352
SICI:
0959-4965(20010212)12:2<349:ISVOS(>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEDIAN NERVE; INHIBITORY INTERNEURONS; SOMATOSENSORY SYSTEM; CORTEX; NEURONS; CELLS; OSCILLATIONS; POTENTIALS; WAVELETS;
Keywords:
high-frequency burst; median nerve; parallel processing; population spikes; response variability; somatosensory evoked potentials; vigilance;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Klostermann, F Free Univ Berlin, Klinikum Benjamin Franklin, Dept Neurol, Neurophys Grp, Hindenburgdamm 30, D-12200 Berlin, Germany Free Univ Berlin Hindenburgdamm 30 Berlin Germany D-12200
Citazione:
F. Klostermann et al., "Independent short-term variability of spike-like (600 Hz) and postsynaptic(N20) cerebral SEP components", NEUROREPORT, 12(2), 2001, pp. 349-352

Abstract

Human scalp-derived somatosensory evoked potentials (SEP) elicited by median nerve stimulation contain an early (20 ms latency) high-frequency (600 Hz) wavelet burst which is supposed to reflect non;invasively the timing of rapidly repeating population spikes in thalamocortical afferences and/or the receiving neocortical cell populations. This burst is superimposed onto the slower (less than or equal to 100 Hz) primary cortical response (N20) representing intracortically generated postsynaptic events. The present studyaddressed the temporal dynamics and correlation of these response components in awake human subjects and found that at a 3 min time scale the burst response was significantly more variable than the concomitant N20, and that the burst and N20 varied independently of each other. Thus, wavelet burst and N20 represent parallel and partly independent. Steps in sensory processing at cortical input stages in awake human subjects. We propose that the N20 represents a stable somatosensory input whereas the more fluctuating high-frequency burst could index variable modes of processing, such as a floating-focus of attention. NeuroReport 12:349-352 (C) 2001 Lippincott Williams & Wilkins.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/01/20 alle ore 09:45:03