IFCN standards for digital recording of clinical EEG

Nuwer, Marc R.; Comi, Giancarlo; Emerson, Ronald G.; Fuglsang-Frederiksen, Anders; Guérit, Jean‐Michel; Hinrichs, Hermann; Ikeda, Akio; Luccas, Francisco José C.; Rappelsburger, Peter

doi:10.1016/s0013-4694(97)00106-5

Cited by 550 publications

(265 citation statements)

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“…58 electrodes were placed on the scalp with an "Easy Cap" (Easycap, Herrsching-Breitbrunn, Germany) using the following locations according to the International 10-10 system (Nuwer et al 1998 During the application of the electrodes, the participants filled out three questionnaires. One questionnaire asked about past head traumata, psychiatric illnesses, drug abuse and medication and asked for gender, age, education and Zen meditation experience.…”

Section: Eeg Recording and Questionnairesmentioning

confidence: 99%

Zazen meditation and no-task resting EEG compared with LORETA intracortical source localization

Faber¹,

Lehmann²,

Gianotti

et al. 2014

Cogn Process

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Meditation is a self-induced and willfully initiated practice that alters the state of consciousness. The meditation practice of Zazen, like many other meditation practices, aims at disregarding intrusive thoughts while controlling body posture. It is an open monitoring meditation characterized by detached moment-to-moment awareness and reduced conceptual thinking and self-reference. Which brain areas differ in electric activity during Zazen compared to task-free resting? Since scalp electroencephalography (EEG) waveforms are reference-dependent, conclusions about the localization of active brain areas are ambiguous. Computing intracerebral source models from the scalp EEG data solves this problem. In the present study we applied source modeling using low resolution brain electromagnetic tomography (LORETA) to 58-channel scalp EEG data recorded from 15 experienced Zen meditators during Zazen and no-task resting. Zazen compared to no-task resting showed increased alpha-1 and alpha-2 frequency activity in an exclusively right-lateralized cluster extending from prefrontal areas including the insula to parts of the somatosensory and motor cortices and temporal areas. Zazen also showed decreased alpha and beta-2 activity in the left angular gyrus and decreased beta-1 and beta-2 activity in a large bilateral posterior cluster comprising the visual cortex, the posterior cingulate cortex and the parietal cortex. The results include parts of the default mode network and suggest enhanced automatic memory and emotion processing, reduced conceptual thinking and self-reference on a less judgmental, i.e., more detached moment-to-moment basis during Zazen compared to no-task resting. Computing intracerebral source models from the scalp EEG data solves this problem. In the present study we applied source modeling using low resolution brain electromagnetic tomography (LORETA) to 58-channel scalp EEG data recorded from 15 experienced Zen meditators during Zazen and no-task resting. Zazen compared to no-task resting showed increased alpha-1 and alpha-2 frequency activity in an exclusively right-lateralized cluster extending from prefrontal areas including the insula to parts of the somatosensory and motor cortices and temporal areas. Zazen also showed decreased alpha and beta-2 activity in the left angular gyrus and decreased beta-1 and beta-2 activity in a large bilateral posterior cluster comprising the visual cortex, the posterior cingulate cortex and the parietal cortex. The results include parts of the default mode network and suggest enhanced automatic memory and emotion processing, reduced conceptual thinking and self-reference on a less judgmental, i.e., more detached moment-to-moment basis during Zazen compared to no-task resting.

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Section: Eeg Recording and Questionnairesmentioning

confidence: 99%

Zazen meditation and no-task resting EEG compared with LORETA intracortical source localization

Faber¹,

Lehmann²,

Gianotti

et al. 2014

Cogn Process

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“…The EEG was recorded with a sampling rate of 500 Hz with a Neuroscan Synamp 2 (Compumedics Inc., Victoria, Australia) amplifier, from 63 Ag/AgCl electrodes mounted on an EasyCap (EASYCAP GmbH, Herrsching, Germany) arranged according to the 10% system (Nuwer et al, 1998), and filtered online with a 100 Hz lowpass filter. The reference electrode was placed on the tip of the nose, the ground electrode on the forehead.…”

Section: Eeg Recordingmentioning

confidence: 99%

Knowledge of sequence structure prevents auditory distraction: An ERP study

Volosin¹,

Horváth²

2014

International Journal of Psychophysiology

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Infrequent, salient stimuli often capture attention despite their task-irrelevancy, and disrupt on-going goal-directed behavior. A number of studies show that presenting cues signaling forthcoming deviants reduces distraction, which may be a "by-product" of cue-processing interference or the result of direct preparatory processes for the forthcoming distracter. In the present study, instead of "bursts" of cue information, information on the temporal structure of the stimulus sequence was provided. Young adults performed a spatial discrimination task where complex tones moving left or right were presented. In the predictable condition, every 7 th tone was a pitch-deviant, while in the random condition the position of deviants was random with a probability of 1/7. Whereas the early event-related potential correlates of deviance-processing (N1, and MMN) were unaffected by predictability, P3a amplitude was significantly reduced in the predictable condition, indicating that prevention of distraction was based on the knowledge about the temporal structure of the stimulus sequence.

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“…Gxx(f)Gyy(f) ===> Potência espectral de x e y A colocação dos eletrodos de escalpo seguiu as normas da Sociedade Brasileira de Neurofisiologia Clínica e da Sociedade Americana de Neurofisiologia Clínica ( sistema 10-20 com referência bi-auricular unida) para a aquisição do EEG [17][18][19] .…”

Section: Métodounclassified

Estudo da coerência do eletrencefalograma para a banda de frequência alfa em indivíduos adultos normais e com provável demência do tipo Alzheimer

Anghinah

Kanda

Jorge

et al. 2000

Arq. Neuro-Psiquiatr.

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RESUMO -Estudamos a coerência inter-hemisférica do espectro do eletrencefalograma (EEG) obtido pela transformada rápida de Fourier, da região occipital do escalpo (eletrodos O1 e O2) para a banda de frequência alfa (alfa 1 -8,0 a 10,0 Hz e alfa 2 -10,1 a 12,5 Hz) em indivíduos normais maiores de 50 anos e pacientes com diagnóstico provável de demência do tipo Alzheimer (DTA), no intuíto de observar se há diferenças entre estes parâmetros que contribuam com o diagnóstico desta enfermidade. Encontramos diminuição na coerência interhemisférica dos indivíduos com DTA para ambas as sub-bandas do ritmo alfa. Acreditamos que a análise de coerência do EEG possa ser um método de grande auxílio no diagnóstico de DTA.PALAVRAS-CHAVE: eletrencefalograma quantitativo, análise de coerência, demência. Alpha band coherence analysis of EEG in healthy adult and Alzheimer's type dementia subjectsABSTRACT -We studied the occiptal inter-hemispheric coherence (IHCoh) of EEG (electrodes O1-O2) for alpha band (alpha 1 -8,0 to 10,0 Hz and alpha 2 -10,1 to 12,5 Hz) in healthy adults and Alzheimer's type dementia (ATD) subjects, to observe if there is any significant difference between these two groups that could help in the early diagnosis of ATD. We found a decrease of occipital IHCoh in ATD group for both alpha sub-bands. We believe that Coh analysis of EEG is a powerful auxiliary method in ATD diagnosis.KEY WORDS: quantitative electroencephalography, coherence analysis, dementia.Coerência (Coh) é a medida da covariância do espectro de dois sinais de eletrencefalograma (EEG). A alta Coh entre dois sinais do EEG tem sido considerada como evidência estrutural e funcional da ocorrência de conexões entre áreas corticais 1 . Desde os primeiros estudos da quantificação do EEG por Lehmann (1971) 2 e Duffy e cols.. (1979) 3 o estudo da análise espectral e estatística do EEG vem sendo largamente utilizado. Contrariamente a isto, estudos da Coh do EEG são raramente encontrados na literatura 4 . A informação obtida pelo estudo da Coh é essencial para o entendimento de como relacionamentos mútuos entre regiões cerebrais podem mudar sob diferentes condições 5 .Das infinitas possibilidades de correlações entre diferentes áreas cerebrais, a análise de Coh é uma medida já estabelecida como capaz de mensurar as relações inter-hemisféricas através do corpo caloso tanto na vigília como no sono 6 .

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IFCN standards for digital recording of clinical EEG

Cited by 550 publications

References 0 publications

Zazen meditation and no-task resting EEG compared with LORETA intracortical source localization

Zazen meditation and no-task resting EEG compared with LORETA intracortical source localization

Knowledge of sequence structure prevents auditory distraction: An ERP study

Estudo da coerência do eletrencefalograma para a banda de frequência alfa em indivíduos adultos normais e com provável demência do tipo Alzheimer

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