Spike-timing control by dendritic plateau potentials in the presence of synaptic barrages.

Spike-timing control by dendritic plateau potentials in the presence of synaptic barrages.
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DOI:
10.3389/fncom.2014.00089
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发表时间:
2014
影响因子:
3.2
通讯作者:
Anastassiou CA
Anastassiou CA
中科院分区:
医学4区
文献类型:
--
作者:
Shai AS;Koch C;Anastassiou CA

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锥体神经元的顶端树突和簇状树突支持再生电位,产生持久(约数百毫秒)和强烈(从静止开始约50 mV)的去极化。这样的平台事件依赖于群集的突触能输入,可以由钙或NMDA电流介导,并且经常产生持续树突平台事件的时间过程的体细胞去极化。我们通过简化但生物物理学上真实的建模来解决这种单神经元处理的计算意义。我们介绍了一个模型的基础上两个离散的整合区,体细胞和树突的,沟通从树突到体细胞室通过一个长的平台电导。我们展示了树突抑制与体细胞抑制控制尖峰时间的方式的原则性差异,并演示了这如何在面对突触输入的冲击时实现尖峰时间控制。
Apical and tuft dendrites of pyramidal neurons support regenerative electrical potentials, giving rise to long-lasting (approximately hundreds of milliseconds) and strong (~50 mV from rest) depolarizations. Such plateau events rely on clustered glutamatergic input, can be mediated by calcium or by NMDA currents, and often generate somatic depolarizations that last for the time course of the dendritic plateau event. We address the computational significance of such single-neuron processing via reduced but biophysically realistic modeling. We introduce a model based on two discrete integration zones, a somatic and a dendritic one, that communicate from the dendritic to the somatic compartment via a long plateau-conductance. We show principled differences in the way dendritic vs. somatic inhibition controls spike timing, and demonstrate how this could implement spike time control in the face of barrages of synaptic inputs.
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