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Titolo:
Event-related desynchronization in reaction time paradigms: a comparison with event-related potentials and corticospinal excitability
Autore:
Leocani, L; Toro, C; Zhuang, P; Gerloff, C; Hallett, M;
Indirizzi:
Natl Inst Neurol Disorders & Stroke, Med Neurol Branch, Human Motor Control Sect, NIH, Bethesda, MD 20892 USA Natl Inst Neurol Disorders & Stroke Bethesda MD USA 20892 a, MD 20892 USA Univ Milan, Hosp San Raffaele, Dept Neurophysiol, Milan, Italy Univ MilanMilan Italy sp San Raffaele, Dept Neurophysiol, Milan, Italy
Titolo Testata:
CLINICAL NEUROPHYSIOLOGY
fascicolo: 5, volume: 112, anno: 2001,
pagine: 923 - 930
SICI:
1388-2457(200105)112:5<923:EDIRTP>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRANSCRANIAL MAGNETIC STIMULATION; MOVEMENT-RELATED POTENTIALS; NO-GO REACTION; SELF-PACED MOVEMENTS; HAND MOVEMENT; COLOR DISCRIMINATION; CORTICAL POTENTIALS; VOLUNTARY MOVEMENT; EVOKED-POTENTIALS; PREFRONTAL CORTEX;
Keywords:
electroencephalography; event-related desynchronization/synchronization; reaction time; simple; choice; go/no go;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: Hallett, M Natl Inst Neurol Disorders & Stroke, Med Neurol Branch, Human Motor Control Sect, NIH, Bldg 10,Room 5N226,10 Ctr Dr MSC 1428, Bethesda, MD20892 USA Natl Inst Neurol Disorders & Stroke Bldg 10,Room 5N226,10 Ctr DrMSC 1428 Bethesda MD USA 20892
Citazione:
L. Leocani et al., "Event-related desynchronization in reaction time paradigms: a comparison with event-related potentials and corticospinal excitability", CLIN NEU, 112(5), 2001, pp. 923-930

Abstract

Objectives: To study cortical activity in different motor tasks, we compared event-related desynchronization (ERD) and event-related potentials (ERPs) in different reaction time (RT) paradigms with the time course of corticospinal excitability. Methods: Nine right-handed, normal subjects performed right or left thumb extensions in simple, choice and go/no go auditory RT paradigms. Eight subjects had participated in a previous study evaluating changes in corticospinal excitability during the same paradigms. Twenty-nine EEG channels with electrooculogram and bilateral EMG monitoring were collected. ERPs and ERD of10 and 18-22 Hz bands were obtained with respect to tone administration and EMG onset. Results: Trials with movement showed lateralized ERP components, corresponding to the motor potential (MP), both in the averages on the tone and on EMG. The MP corresponded well in time and location to the rise in corticospinal excitability on the moving side observed in the previous study. Sensorimotor ERD, followed by event-related synchronization (ERS), was present fortrials with movements and for the no go. ERD was present contralaterally during movement preparation and in no go trials, while it was bilateral during motor execution. No go ERD was followed more rapidly by ERS than in trials with movement. This finding suggests that in no go trials, there is a brief active process in the sensorimotor areas. ERD and ERS do not correspond, respectively, in time and location to increases and decreases in corticospinal excitability. In fact, ERD is bilateral during movement execution, when corticospinal inhibition of the side at rest is observed. Contralateral no go ERS occurs later than corticospinal inhibition, which is bilateral. Conclusions: These findings may suggest that ERD is compatible with both corticospinal activation and inhibition, ERS indicating the removal of either, resulting in cortical idling. (C) 2001 Elsevier Science Ireland Ltd. Allrights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 12:19:00