arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2011.12050q-bio.NCcond-mat.dis-nncond-mat.stat-mech
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抑制性神经元在临界和超临界自发活动时间关联中的作用

Role of inhibitory neurons in temporal correlations of critical and supercritical spontaneous activity

Dario Raimo, Alessandro Sarracino, Lucilla de Arcangelis

摘要:

实验和数值结果表明,大脑可以被看作是一个系统的作用接近临界点,在各种不同的系统和模型的相关量的无标度分布证实。很少有人注意到在不同的健康和病理条件下的大脑活动的时间相关功能的调查。在这里,我们通过一个模型进行这种分析,该模型具有短期和长期的可塑性,它实现了兴奋性和抑制性神经元的不同恢复率的新功能,实验发现。我们的证据所发挥的重要作用,抑制性神经元在超临界状态:我们检测到一个意想不到的振荡行为的相关衰减,其频率取决于抑制性神经元的分数和它们的连接程度。这种行为可以通过观察来合理化,即当抑制变得更相关时,活动的爆发变得更频繁,幅度更小。

英文摘要:

Experimental and numerical results suggest that the brain can be viewed as a system acting close to a critical point, as confirmed by scale-free distributions of relevant quantities in a variety of different systems and models. Less attention has received the investigation of the temporal correlation functions in brain activity in different, healthy and pathological, conditions. Here we perform this analysis by means of a model with short and long-term plasticity which implements the novel feature of different recovery rates for excitatory and inhibitory neurons, found experimentally. We evidence the important role played by inhibitory neurons in the supercritical state: We detect an unexpected oscillatory behaviour of the correlation decay, whose frequency depends on the fraction of inhibitory neurons and their connectivity degree. This behaviour can be rationalized by the observation that bursts in activity become more frequent and with a smaller amplitude as inhibition becomes more relevant.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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