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arXiv 1304.2149q-bio.NC
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局部皮层网络的相关结构本质上是由循环动力学引起的

The correlation structure of local cortical networks intrinsically results from recurrent dynamics

Moritz Helias, Tom Tetzlaff, Markus Diesmann

摘要:

长期以来,神经元对在短时间间隔内的动作电位的共同出现是已知的。这样的同步事件可以出现时间锁定到动物的行为,并且理论上的考虑也主张同步的功能作用。早期的理论工作试图解释神经元由于共享输入而传递共同波动的相关活动。然而,这高估了相关性。最近,皮层网络的经常性连接被证明是观察到的低基线相关性的原因。有两种不同的解释:一种认为,兴奋性和抑制性群体活动密切关注网络的外部输入,因此它们对一对细胞的影响相互抵消。另一种解释依赖于负的经常性反馈来抑制种群活动的波动,相当于小的相关性。在生物神经元网络中,人们期望外部输入和重现两者都影响相关的活动。目前的工作扩展了相关性的理论框架,包括两个贡献,并解释了它们的质的差异。此外,研究表明,快速跟踪和经常性反馈的论点是不等价的,只有后者正确预测的细胞类型的具体相关性。

英文摘要:

The co-occurrence of action potentials of pairs of neurons within short time intervals is known since long. Such synchronous events can appear time-locked to the behavior of an animal and also theoretical considerations argue for a functional role of synchrony. Early theoretical work tried to explain correlated activity by neurons transmitting common fluctuations due to shared inputs. This, however, overestimates correlations. Recently the recurrent connectivity of cortical networks was shown responsible for the observed low baseline correlations. Two different explanations were given: One argues that excitatory and inhibitory population activities closely follow the external inputs to the network, so that their effects on a pair of cells mutually cancel. Another explanation relies on negative recurrent feedback to suppress fluctuations in the population activity, equivalent to small correlations. In a biological neuronal network one expects both, external inputs and recurrence, to affect correlated activity. The present work extends the theoretical framework of correlations to include both contributions and explains their qualitative differences. Moreover the study shows that the arguments of fast tracking and recurrent feedback are not equivalent, only the latter correctly predicts the cell-type specific correlations.

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