Event-related dynamics of cortical rhythms: frequency-specific features and functional correlates

Neuper, Christa; Pfurtscheller, Gert

doi:10.1016/s0167-8760(01)00178-7

Cited by 750 publications

(556 citation statements)

References 51 publications

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“…Each participant's fast alpha band ranged from IAF at the lower bound to (IAF+2 Hz) at the upper bound. ERD/ERS was calculated as a percentage of power decrease (ERD) or increase (ERS), relative to the 200 ms pre-stimulus baseline (Neuper & Pfurtscheller, 2001). Consistent with published reports (Neubauer et al, 2006), electrodes were collapsed into linearly-derived channels (created from clusters of 7 contiguous EEG channels) representing grossly-defined brain regions (see Figure caption).…”

Section: Eeg Recording and Signal Conditioningmentioning

confidence: 99%

“…Event-related desynchronization (ERD) and synchronization (ERS) of upper, or "fast," EEG alpha frequency band activity, a measure of power decrease (ERD) or increase (ERS) as a percentage of pre-stimulus power (Neuper & Pfurtscheller, 2001), have been associated consistently with individual differences in neurocognitive efficiency measured during performance of challenging cognitive tasks, including paradigms that place heavy demands on WM (Neubauer et al, 2006). Research into the mechanisms underlying these fluctuations in power has demonstrated that alpha ERD reflects increased excitability of active cerebral cortex, whereas, alpha ERS appears to reflect decreased excitability, or large-scale inhibition, of cortex (Neuper & Pfurtscheller, 2001).…”

Section: Introductionmentioning

confidence: 99%

“…Research into the mechanisms underlying these fluctuations in power has demonstrated that alpha ERD reflects increased excitability of active cerebral cortex, whereas, alpha ERS appears to reflect decreased excitability, or large-scale inhibition, of cortex (Neuper & Pfurtscheller, 2001). …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Abnormally high EEG alpha synchrony during working memory maintenance in twins discordant for schizophrenia

Bachman

Kim

Yee

et al. 2008

Schizophrenia Research

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Section: Eeg Recording and Signal Conditioningmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Abnormally high EEG alpha synchrony during working memory maintenance in twins discordant for schizophrenia

Bachman

Kim

Yee

et al. 2008

Schizophrenia Research

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“…Posterior parietal cortex: attention and sensory integration processes -Our results show reduced asymmetry at P3/P4. Beta activity is related to stimulation processes and voluntary movements 26,27 . Posterior parietal cortex (Brodmann areas 5 and 7) is located next to the somatosensory primary area (S-1) and possesses neurons with great receptive fi elds, which allows this region to specialize in differentiated and complex activities.…”

Section: Discussionmentioning

confidence: 99%

Motor learning processes: an electrophysiologic perspective

Velasques

Ferreira

Teixeira

et al. 2007

Arq. Neuro-Psiquiatr.

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-The goal of the present study was to investigate electrophysiologic, qEEG, changes when individuals were exposed to a motor task. Subjects' brain electrical activity was analyzed before and after the typewriting training task. For the neurophysiological variable asymmetry, a paired t-test was performed to compare each moment, pre and post-task, in the beta bands. The findings showed a change for the qEEG variable in each scalp site, F3/F4; C3/C4 and P3/P4. These results suggest an adaptation of pre-frontal, sensory-motor and parietal cortex, as a consequence of the typewriting training.KEY WORDS: sensory-motor integration, procedural learning, qEEG. Processos de aprendizagem motora: uma perspectiva eletrofisiológicaRESUMO -O objetivo do presente estudo foi investigar mudanças eletrofisiológicas através do EEGq quando indivíduos são expostos a uma tarefa motora. A atividade elétrica no córtex dos sujeitos foi analisada antes e após o treinamento da tarefa motora. Para a variável neurofisiológica assimetria, um teste t foi implementado para comparar cada momento, pré e pós-tarefa, na banda beta. Os achados demonstraram mudança em assimetria para as seguintes regiões no escalpo: F3/F4, C3/C4 e P3/P4. Estes resultados sugerem uma adaptação das regiões pré-frontal, somatosensorial e parietal como conseqüência do treinamento de datilografia. PALAVRAS-CHAVE: integração sensório-motora, memória de procedimento, EEGq. Velasques -Rua Paula Brito 350 / 1102 -20541-190 Rio de Janeiro RJ -Brasil. E-mail: bruna_velasques@yahoo.com.br To maintain stability at a highly dynamic environment, the central nervous system (CNS) is in constant activity. It continuously receives external sensory stimuli, many specifi cally required to maintain motor performance [1][2][3] . Many studies have demonstrated that precision during the motor gesture is increased as consequence of motor learning 4,5 . Motor learning promotes a gradual minimization of task errors, an increase in coordination, agility and movement execution 6 . Dra. Bruna BrandãoDifferent mechanisms take part in the complexity of motor learning which involves various levels of cortical structures, such as: pre frontal areas related to decision making, contralateral primary motor cortex 7 , ipsilateral primary motor cortex, supplementary motor area, pre motor area, primary sensory areas 8 , and the parietal region responsible for information integration processes. The different functional components and the plastic reorganization of the CNS have lead to investigations objecting the examination of neurofunctional phenomena involving motor learning 9 .Hence, this study aimed at investigating how participative is the learning of a motor task in the cortex organizational mapping. For that, we used quantitative electroencephalography (qEEG) to detect neural changes during the motor learning process 10 . Beta activity was specifi cally investigated, since it is responsive to movements and electro-stimulation of limbs 11,12 .

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“…In this manner, the most appropriate interpretation to our findings is that theta activity plays a role of a basic mechanism of information transmission among cortical areas 20,21 . The C3-C4 electrode pair is located near the primary somatomotor cortex, a region functionally related to sensorimotor representations of several body parts 22 . Additionally, there are studies that report the involvement of this region not only in limb's motor command, but also related to motor programming 23 .…”

Section: Changes In Theta Asymmetry (4-8 Hz)mentioning

confidence: 99%

Effects of a cognitive modulator in the theta and alpha asymmetry during a typewriting task: a sensorimotor integration perspective

Cunha

Machado

Miana

et al. 2009

Arq. Neuro-Psiquiatr.

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-This study aimed to elucidate cortical mechanisms and to identify the areas where occur such mechanisms due to interaction between bromazepam and motor learning. The sample was composed of 45 healthy subjects randomly distributed in 3 groups: placebo (n=15), bromazepam 3 mg (n=15) or bromazepam 6 mg (n=15). To perform the experimental task, subjects sat comfortably at a distance of approximately 20 cm from the typewriter. The typewriter keyboard was covered with a wooden box to avoid visual information about the hands' position. The typewriting task was performed concomitantly with EEG recording. ANOVA two-way results indicated a decreased asymmetry in sensorimotor areas in the experimental groups. Our interpretation is that moderate doses of bromazepam may improve performance on tasks with predictable elements to promote stability of psychomotor functions, but may also impair performance on tasks executed in unpredictable environments.KEy wOrds: bromazepam, motor learning, qEEG, asymmetry, sensorimotor integration.Efeitos de um modulador cognitivo na assimetria de teta e alfa durante uma tarefa de datilografia: uma perspectiva da integração sensório-motora Resumo -O objetivo do estudo foi elucidar mecanismos corticais e identificar as áreas onde estas ocorrem tais mecanismos devido à interação entre bromazepam e aprendizagem motora. A amostra compreendeu 45 sujeitos hígidos distribuídos randomicamente em 3 grupos: placebo (n=15), bromazepam 3 mg (n=15) ou bromazepam 6 mg (n=15). Para a realização da tarefa experimental, sujeitos sentaram-se confortavelmente a uma distância de aproximadamente 20 cm da máquina de escrever. O teclado da máquina foi coberto com uma caixa de madeira para evitar informações visuais sobre a posição das mãos. O registro do EEGq ocorreu simultaneamente à tarefa de datilografia. Os resultados da ANOVA two-way indicaram menor assimetria em áreas sensório-motoras nos grupos experimentais. Nossa interpretação é que doses moderadas de bromazepam podem melhorar o desempenho em tarefas previsíveis por promover estabilidade das funções psicomotoras, mas pode prejudicar o desempenho em tarefas realizadas em ambientes imprevisíveis.PAlAVrAs-ChAVE: bromazepam, aprendizagem motora, EEGq, assimetria, integração sensório-motora.

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Event-related dynamics of cortical rhythms: frequency-specific features and functional correlates

Cited by 750 publications

References 51 publications

Abnormally high EEG alpha synchrony during working memory maintenance in twins discordant for schizophrenia

Abnormally high EEG alpha synchrony during working memory maintenance in twins discordant for schizophrenia

Motor learning processes: an electrophysiologic perspective

Effects of a cognitive modulator in the theta and alpha asymmetry during a typewriting task: a sensorimotor integration perspective

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