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arXiv 2102.01803q-bio.NCstat.APstat.CO
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从同时观察到的突触前和突触后尖峰脉冲跟踪突触权重的快速和缓慢变化

Tracking fast and slow changes in synaptic weights from simultaneously observed pre- and postsynaptic spiking

Ganchao Wei, Ian H. Stevenson

摘要:

由于短期和长期可塑性的结合,突触在多个时间尺度上变化,从毫秒到分钟不等。在这里,我们开发了一个扩展的通用广义线性模型来推断短期和长期的变化之间的耦合前和突触后神经元的基础上观察到的尖峰活动。我们模型短期突触可塑性使用依赖于突触前尖峰时间的加性效应,我们模型突触重量和基线放电率的长期变化使用点过程自适应平滑。使用模拟,我们首先表明,该模型可以准确地恢复时变的突触权重1)抑制和促进突触,2)与各种长期变化(包括现实的变化,如由于STDP),3)与一系列的突触前和突触后放电率,和4)兴奋性和抑制性突触。然后,我们将我们的模型应用到两个实验记录的假定突触连接。我们发现,同时跟踪快速变化的突触权重,缓慢变化的突触权重,和无法解释的变化的基线发射是必不可少的。忽略这些因素中的任何一个都可能导致对其他因素的虚假推断。总之,该模型提供了一个灵活的框架,跟踪短期和长期的变化尖峰传输。

英文摘要:

Synapses change on multiple timescales, ranging from milliseconds to minutes, due to a combination of both short- and long-term plasticity. Here we develop an extension of the common Generalized Linear Model to infer both short- and long-term changes in the coupling between a pre- and post-synaptic neuron based on observed spiking activity. We model short-term synaptic plasticity using additive effects that depend on the presynaptic spike timing, and we model long-term changes in both synaptic weight and baseline firing rate using point process adaptive smoothing. Using simulations, we first show that this model can accurately recover time-varying synaptic weights 1) for both depressing and facilitating synapses, 2) with a variety of long-term changes (including realistic changes, such as due to STDP), 3) with a range of pre- and post-synaptic firing rates, and 4) for both excitatory and inhibitory synapses. We then apply our model to two experimentally recorded putative synaptic connections. We find that simultaneously tracking fast changes in synaptic weights, slow changes in synaptic weights, and unexplained variations in baseline firing is essential. Omitting any one of these factors can lead to spurious inferences for the others. Altogether, this model provides a flexible framework for tracking short- and long-term variation in spike transmission.

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