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启用电场模型的微观现实的大脑

Zhen Qi, Gregory M Noetscher, Alton Miles

bioRxiv : the preprint server for biology

|April 22, 2024

概括

这项研究在微观水平上模拟了大脑刺激,揭示了细胞结构对电场的影响最小. 这一发现支持现有的关于非侵入性脑刺激技术的理论.

科学领域:

神经科学是一个神经科学.
计算生物学计算生物学
生物物理学的生物物理.

背景情况:

模拟大脑刺激对于理解神经元激活至关重要.
之前的模型经常假设宏观的同质性,忽视了微观细节.
图像和分析方面的进步使得细致的微观建模成为可能.

研究的目的:

在小鼠视觉皮层样本中创建细胞外电场分布的最大地图.
研究微观电场干扰对神经元激活值的影响.
为了验证跨刺激的宏观模型.

主要方法:

连续断面电子显微镜图像的自动分析.
使用边界元素快速多极方法计算微观电场扰动.
在细胞层面绘制细胞外电场分布图.

主要成果:

产生了迄今为止最大的细胞外电场地图 (250 × 140 × 90 μm3).
微观场干扰 ("电场空间噪声") 对神经元激活值的影响很小 (平均变化<10%).
在TMS和TES的大脑宏观模型中证明了"隐形神经元"假设的合理性.

结论:

微观细节对整体神经元激活值的影响有限.
宏观模型足以预测非侵入性脑刺激中的刺激效应.
未来的工作应该包括微毛细管网络和复杂的刺激模式.

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