具有不对称噪声和不均匀耦合的双神经元图案的噪声诱导同步性

IF 2.1 4区 医学 Q2 MATHEMATICAL & COMPUTATIONAL BIOLOGY Frontiers in Computational Neuroscience Pub Date : 2024-02-23 DOI:10.3389/fncom.2024.1347748
Gurpreet Jagdev, Na Yu
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引用次数: 0

摘要

同步动力学在各种认知过程中起着举足轻重的作用。以往的研究广泛研究了噪声在耦合神经振荡器中诱导的同步性,重点关注神经元之间具有均匀噪声和相等耦合强度的情况。然而,现实世界或实验环境经常表现出异质性,包括耦合和噪声模式偏离均匀性。本研究调查了在异质环境中运行的一对耦合可兴奋神经元的噪声诱导同步性,在这种环境中,噪声强度和耦合强度都可以独立变化。每个神经元都是一个可兴奋振荡器,以霍普夫分岔(HB)的正常形式表示。在没有刺激的情况下,这些神经元会保持静态,但会被噪声等扰动触发。通常情况下,噪声和耦合会对神经动态产生相反的影响,噪声会降低一致性,而耦合则会促进同步性。我们的研究结果表明,非对称噪声能够在这种耦合神经振荡器中诱导同步,当系统接近兴奋阈值(即 HB)时,同步会变得越来越明显。此外,我们发现不均匀的耦合强度和噪声不对称也是促进同相同步的因素。值得注意的是,当耦合强度的绝对差值达到最大时,无论选择的具体耦合强度如何,我们都能识别出最佳同步状态。此外,我们还在耦合不对称性和最大化同步所需的噪声强度之间建立了稳健的关系。具体来说,当一个振荡器(接收神经元)从另一个振荡器(源神经元)接收强输入,而源神经元从接收神经元接收的输入明显较弱或没有输入时,当应用于接收神经元的噪声比应用于源神经元的噪声弱得多时,同步性达到最大。这些发现揭示了耦合神经元振荡器中不均匀耦合与不对称噪声之间的重要联系,阐明了单向连接的双神经元图案与双向连接的双神经元图案相比,具有更强的同相同步倾向。这项研究有助于更深入地了解网络图案在神经元动力学中的功能作用。
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Noise-induced synchrony of two-neuron motifs with asymmetric noise and uneven coupling
Synchronous dynamics play a pivotal role in various cognitive processes. Previous studies extensively investigate noise-induced synchrony in coupled neural oscillators, with a focus on scenarios featuring uniform noise and equal coupling strengths between neurons. However, real-world or experimental settings frequently exhibit heterogeneity, including deviations from uniformity in coupling and noise patterns. This study investigates noise-induced synchrony in a pair of coupled excitable neurons operating in a heterogeneous environment, where both noise intensity and coupling strength can vary independently. Each neuron is an excitable oscillator, represented by the normal form of Hopf bifurcation (HB). In the absence of stimulus, these neurons remain quiescent but can be triggered by perturbations, such as noise. Typically, noise and coupling exert opposing influences on neural dynamics, with noise diminishing coherence and coupling promoting synchrony. Our results illustrate the ability of asymmetric noise to induce synchronization in such coupled neural oscillators, with synchronization becoming increasingly pronounced as the system approaches the excitation threshold (i.e., HB). Additionally, we find that uneven coupling strengths and noise asymmetries are factors that can promote in-phase synchrony. Notably, we identify an optimal synchronization state when the absolute difference in coupling strengths is maximized, regardless of the specific coupling strengths chosen. Furthermore, we establish a robust relationship between coupling asymmetry and the noise intensity required to maximize synchronization. Specifically, when one oscillator (receiver neuron) receives a strong input from the other oscillator (source neuron) and the source neuron receives significantly weaker or no input from the receiver neuron, synchrony is maximized when the noise applied to the receiver neuron is much weaker than that applied to the source neuron. These findings reveal the significant connection between uneven coupling and asymmetric noise in coupled neuronal oscillators, shedding light on the enhanced propensity for in-phase synchronization in two-neuron motifs with one-way connections compared to those with two-way connections. This research contributes to a deeper understanding of the functional roles of network motifs that may serve within neuronal dynamics.
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来源期刊
Frontiers in Computational Neuroscience
Frontiers in Computational Neuroscience MATHEMATICAL & COMPUTATIONAL BIOLOGY-NEUROSCIENCES
CiteScore
5.30
自引率
3.10%
发文量
166
审稿时长
6-12 weeks
期刊介绍: Frontiers in Computational Neuroscience is a first-tier electronic journal devoted to promoting theoretical modeling of brain function and fostering interdisciplinary interactions between theoretical and experimental neuroscience. Progress in understanding the amazing capabilities of the brain is still limited, and we believe that it will only come with deep theoretical thinking and mutually stimulating cooperation between different disciplines and approaches. We therefore invite original contributions on a wide range of topics that present the fruits of such cooperation, or provide stimuli for future alliances. We aim to provide an interactive forum for cutting-edge theoretical studies of the nervous system, and for promulgating the best theoretical research to the broader neuroscience community. Models of all styles and at all levels are welcome, from biophysically motivated realistic simulations of neurons and synapses to high-level abstract models of inference and decision making. While the journal is primarily focused on theoretically based and driven research, we welcome experimental studies that validate and test theoretical conclusions. Also: comp neuro
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