In the field of epilepsy, the analysis of stereoelectroencephalographic (SEEG, intra-cerebral recording) signals with signal processing methods can help to better identify the epileptogenic zone, the area of the brain responsible for triggering seizures, and to better understand its organization. In order to evaluate these methods and to physiologically interpret the results they provide, we developed a model able to produce EEG signals from "organized" networks of neural populations. Starting from a neurophysiologically relevant model initially proposed by Lopes Da Silva et al. [Lopes da Silva FH, Hoek A, Smith H, Zetterberg LH (1974) Kybernetic 15: 27-37] and recently re-designed by Jansen et al. [Jansen BH, Zouridakis G, Brandt ME (1993) Biol Cybern 68: 275 283] the present study demonstrates that this model can be extended to generate spontaneous EEG signals from multiple coupled neural populations. Model parameters related to excitation, inhibition and coupling are then altered to produce epileptiform EEG signals. Results show that the qualitative behavior of the model is realistic; simulated signals resemble those recorded from different brain structures for both interictal and ictal activities. Possible exploitation of simulations in signal processing is illustrated through one example; statistical couplings between both simulated signals and real SEEG signals are estimated using nonlinear regression. Results are compared and show that, through the model, real SEEG signals can be interpreted with the aid of signal processing methods.

译文

:在癫痫领域,使用信号处理方法分析立体脑电图(SEEG,脑内记录)信号可以帮助更好地识别癫痫发生区,负责触发癫痫发作的大脑区域,并更好地了解其组织。为了评估这些方法并从生理上解释它们提供的结果,我们开发了一种能够从“有组织的”神经种群网络中产生脑电信号的模型。从Lopes Da Silva等人最初提出的神经生理学相关模型开始。 [Lopes da Silva FH,Hoek A,Smith H,Zetterberg LH(1974)Kybernetic 15:27-37],最近由Jansen等人重新设计。 [Jansen BH,Zouridakis G,Brandt ME(1993)Biol Cyber​​n 68:275 283]该研究表明,该模型可以扩展以从多个耦合的神经群体中产生自发性EEG信号。然后改变与激发,抑制和偶联有关的模型参数,以产生癫痫样脑电信号。结果表明,该模型的定性行为是现实的。模拟的信号类似于从不同的大脑结构记录的有关发作和发作活动的信号。通过一个示例说明了信号处理中对仿真的可能利用。使用非线性回归估计模拟信号和实际SEEG信号之间的统计耦合。比较结果表明,通过该模型,可以借助信号处理方法来解释实际的SEEG信号。

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