We defined the single-neuron cumulative co-firing strength as the total pairwise activity correlation strength of a given node in a weighted graph. As a reference, the strength in a weighted graph can be compared to the degree in a binary graph, which accounts for the number of the node’s neighbours. Here, the strength S i of a node i is the sum of all the weights w ij of the edges projected from that node:
where N is the number of neurons j that node i projects to.
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