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首页> 外文期刊>The European Journal of Neuroscience >Pathological responses to single-pulse electrical stimuli in epilepsy: The role of feedforward inhibition
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Pathological responses to single-pulse electrical stimuli in epilepsy: The role of feedforward inhibition

机译:对癫痫单脉冲电刺激的病理反应:馈电抑制的作用

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Delineation of epileptogenic cortex in focal epilepsy patients may profit from single-pulse electrical stimulation during intracranial EEG recordings. Single-pulse electrical stimulation evokes early and delayed responses. Early responses represent connectivity. Delayed responses are a biomarker for epileptogenic cortex, but up till now, the precise mechanism generating delayed responses remains elusive. We used a data-driven modelling approach to study early and delayed responses. We hypothesized that delayed responses represent indirect responses triggered by early response activity and investigated this for 11 patients. Using two coupled neural masses, we modelled early and delayed responses by combining simulations and bifurcation analysis. An important feature of the model is the inclusion of feedforward inhibitory connections. The waveform of early responses can be explained by feedforward inhibition. Delayed responses can be viewed as second-order responses in the early response network which appear when input to a neural mass falls below a threshold forcing it temporarily to a spiking state. The combination of the threshold with noisy background input explains the typical stochastic appearance of delayed responses. The intrinsic excitability of a neural mass and the strength of its input influence the probability at which delayed responses to occur. Our work gives a theoretical basis for the use of delayed responses as a biomarker for the epileptogenic zone, confirming earlier clinical observations. The combination of early responses revealing effective connectivity, and delayed responses showing intrinsic excitability, makes single-pulse electrical stimulation an interesting tool to obtain data for computational models of epilepsy surgery.
机译:歧视癫痫患者癫痫患者的划分物在颅内EEG记录中的单脉冲电刺激中可能来自单脉冲电刺激。单脉冲电刺激唤起早期和延迟的反应。早期响应代表连通性。延迟反应是癫痫皮层的生物标志物,但直到现在,产生延迟响应的精确机制仍然难以捉摸。我们使用了数据驱动的建模方法来研究早期和延迟响应。我们假设延迟响应代表因早期反应活动引发的间接反应,并针对11名患者调查这一点。使用两个耦合的神经肿块,我们通过组合模拟和分叉分析来建模早期和延迟响应。模型的一个重要特征是包含前馈抑制连接。早期反应的波形可以通过前馈抑制来解释。延迟响应可以被视为早期响应网络中的二阶响应,当输入到神经质量的输入时出现在临时临时施加到尖刺状态的阈值下方。噪声背景输入的阈值的组合解释了延迟响应的典型随机外观。神经质量的内在兴奋性和其输入的强度影响到发生延迟响应的概率。我们的作品为使用延迟反应作为癫痫区域的生物标志物提供理论依据,确认早期的临床观察。早期反应的结合揭示了有效的连接和延迟响应,显示了内在兴奋性,使单脉冲电刺激成为有趣的工具,以获得癫痫手术的计算模型的数据。

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