نتایج جستجو برای: electroencephalographic signal

تعداد نتایج: 422284  

Journal: :Epilepsia and paroxyzmal conditions 2023

The article is aimed at familiarizing medical specialists involved in registration and analysis of electroencephalographic (EEG) examinations with the basic principles operation design a modern EEG recorder. Understanding technical fundamentals behind equipment should help personnel to correctly use all its capabilities ultimately improve quality care. diagram electroencephalograph operation, t...

B Babadi B Bahrami M Noroozian R Seyedsadjadi

Fractal dimension of the electroencephalographic (EEG) signal has been argued to reflect the complexity of the underlying brain processes. To this date, conventional studies of EEG in mood disorders have not been able to distinguish between patients and normal individuals. Here we show that, compared to normal subjects, EEG fractal dimension is significantly augmented in the manic episode of bi...

B Babadi B Bahrami M Noroozian R Seyedsadjadi

Fractal dimension of the electroencephalographic (EEG) signal has been argued to reflect the complexity of the underlying brain processes. To this date, conventional studies of EEG in mood disorders have not been able to distinguish between patients and normal individuals. Here we show that, compared to normal subjects, EEG fractal dimension is significantly augmented in the manic episode of bi...

2010
Pavel BHOWMIK P. Bhowmik S. Das D. Nandi A. Chakraborty A. Konar A. K. Nagar

Duffing Oscillator is well known for its chaotic behaviour. This paper aims at clustering of emotions from the EEG response to external audio-visual stimulus used for excitation of a subject. The EEG signal corresponding to a specific emotive stimulus is used as an excitation input to a non-linear Duffing Oscillator dynamics, and the phase trajectory plots of the two state variables of the osci...

Journal: :Anesthesiology 2007
Rain Ferenets Ann Vanluchene Tarmo Lipping Björn Heyse Michel M R F Struys

BACKGROUND Several new measures based on the regularity of the electroencephalogram signal for the assessment of depth of anesthesia/sedation have been proposed recently. In this study we analyze the influence of remifentanil and electroencephalogram frequency content of the performance of a set of such measures. METHODS Forty-five patients with American Society of Anesthesiologists physical ...

Journal: :Computer methods and programs in biomedicine 2007
Vangelis P. Oikonomou Alexandros T. Tzallas Dimitrios I. Fotiadis

In this work, we present a methodology for spike enhancement in electroencephalographic (EEG) recordings. Our approach takes advantage of the non-stationarity nature of the EEG signal using a time-varying autoregressive model. The time-varying coefficients of autoregressive model are estimated using the Kalman filter. The results show considerable improvement in signal-to-noise ratio and signif...

Journal: :Biomedical Signal Processing and Control 2021

We consider the problem of localization sources brain electrical activity from electroencephalographic (EEG) and magnetoencephalographic (MEG) measurements using spatial filtering techniques. propose novel reduced-rank indices based on minimum-variance pseudo-unbiased estimation (MV-PURE) framework. The main results this paper establish key unbiasedness property proposed their higher resolution...

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