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Titolo:
Uncoupling of contingent negative variation and alpha band event-related desynchronization in a go/no-go task
Autore:
Filipovic, SR; Jahanshahi, M; Rothwell, JC;
Indirizzi:
Natl Hosp Neurol & Neurosurg, Dept Clin Neurol, Inst Neurol, London WC1N 3BG, England Natl Hosp Neurol & Neurosurg London England WC1N 3BG n WC1N 3BG, England Natl Hosp Neurol & Neurosurg, MRC, Human Movement & Balance Unit, London WC1N 3BG, England Natl Hosp Neurol & Neurosurg London England WC1N 3BG n WC1N 3BG, England
Titolo Testata:
CLINICAL NEUROPHYSIOLOGY
fascicolo: 7, volume: 112, anno: 2001,
pagine: 1307 - 1315
SICI:
1388-2457(200107)112:7<1307:UOCNVA>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOVEMENT-RELATED POTENTIALS; SELF-PACED MOVEMENT; CORTICAL POTENTIALS; VOLUNTARY MOVEMENT; SYNCHRONIZATION ERS; PRIMATE PREMOTOR; EEG; CORTEX; SUPPLEMENTARY; ACTIVATION;
Keywords:
go/no-go decision; contingent negative variation; event-related desynchronization; movement suppression; motor control;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Jahanshahi, M Natl Hosp Neurol & Neurosurg, Neuropsyhol Dept, Queen Sq, London WC1N 3BG,England Natl Hosp Neurol & Neurosurg Queen Sq London EnglandWC1N 3BG
Citazione:
S.R. Filipovic et al., "Uncoupling of contingent negative variation and alpha band event-related desynchronization in a go/no-go task", CLIN NEU, 112(7), 2001, pp. 1307-1315

Abstract

Objectives: To examine how the differences in the sequences of brain activation during the go/no-go delayed response choice reaction time (RT) task are reflected into two concurrent methods of measuring brain electrical activity, the alpha band event-related desynchronization (alpha ERD) and the contingent negative variation (CNV). Methods: alpha ERD and CNV were calculated using appropriate techniques from the same samples of electroencephalographic activity recorded during performance of a cued choice go/no-go delayed response RT task (i.e. SI (go/no-go)-S2 paradigm) in 8 healthy subjects. Results: All segments of the CNV traces were different in the go and the no-go conditions. The go CNV traces displayed a typical pattern of slow rising negativity reflecting the build-up of attentional resources necessary for adequate performance of the task. On the other hand, the no-go traces remained close to zero reflecting the 'withdrawal' of further preparation after evaluation of S1. During the same period, both go and no-go ERD traces showed a gradual decrease in alpha band power (desynchronization) that was evident until Shortly before the presentation of S2. It was only in the 500 ms before 52 presentation that there was any indication that the go and no-go ERD traces were different, but this did not reach statistical significance. Conclusions: Our data show that the pattern of the go/no-go difference in alpha ERD traces does not correspond to the pattern that can be seen in theCNV tracts. This suggests that there is no direct coupling of CNV and alpha ERD, most probably because they measure different aspects of cortical electrical activity. In addition, the extent of the no-go alpha ERD reveals that refraining from performance of a pre-programmed movement is by no means a passive/inactive process. (C) 2001 Elsevier Science Ireland Ltd. All rights reserved.

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Documento generato il 11/07/20 alle ore 21:05:32