The Effects of Background Noise on a Biophysical Model of Olfactory Bulb Mitral Cells

The Effects of Background Noise on a Biophysical Model of Olfactory Bulb Mitral Cells
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背景噪声对嗅球二尖瓣细胞生物物理模型的影响

DOI:
10.1007/s11538-022-01066-8
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发表时间:
2022
影响因子:
3.5
通讯作者:
Ly, Cheng
Ly, Cheng
中科院分区:
数学4区
文献类型:
--
作者:
Craft, Michelle;Ly, Cheng

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嗅球二尖瓣细胞(MC)的尖峰活动是下游皮质区域嗅觉感觉信息处理的关键属性。对 MC 尖峰统计数据调制的更详细了解可以为嗅球电路和嗅觉编码的机制研究提供线索。我们研究了最近开发的单室生物物理 MC 模型的尖峰响应,该模型包含七个已知的离子电流和钙动力学,受到背景白噪声的恒定电流输入的影响。即使在恒定电流输入下,我们也观察到丰富的尖峰动态,包括尖峰间间隔分布(ISI)中的多峰。尽管固定电流输入的弱到中等背景噪声不会对放电率产生太大影响,但尖峰动态可能会发生巨大变化,表现出标准神经元模型中不常见的非单调尖峰变异性。我们用 ISI 概率密度函数的唯象模型来解释这些动态。我们的研究阐明了 MC 尖峰动力学的一些复杂性。
The spiking activity of mitral cells(MC)in the olfactory bulb is a key attribute in olfactory sensory information processing to downstream cortical areas. A more detailed understanding of the modulation of MC spike statistics could shed light on mechanistic studies of olfactory bulb circuits and olfactory coding. We study the spike response of a recently developed single-compartment biophysical MC model containing seven known ionic currents and calcium dynamics subject to constant current input with background white noise. We observe rich spiking dynamics even with constant current input, including multimodal peaks in the interspike interval distribution(ISI). Although weak-to-moderate background noise for a fixed current input does not change the firing rate much, the spike dynamics can change dramatically, exhibiting non-monotonic spike variability not commonly observed in standard neuron models. We explain these dynamics with a phenomenological model of the ISI probability density function. Our study clarifies some of the complexities of MC spiking dynamics.
DOI: 10.1016/j.isci.2021.102946
发表时间: 2021-09-24
期刊: iScience
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Ly C;Barreiro AK;Gautam SH;Shew WL
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