Figure 3: The effect of indirect connectivity on correlation peaks. The edge AB, BC, CD, and DE are directed. The associated correlation peaks are high and narrow because there is a direct dependency between the activity of neuron A(B,C,D or E) and the one of neuron B(C,D or E). The links AC, AD and AE are indirect, with increasing order of correlation between the neurons because of more intermediary cells on the paths that link A to C, D and E. The longer the path, the weaker the dependency between the neurons which results in a lower and wider correlation peak.
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