Table 1. Edge-based parameters describing the twenty-six-node cerebellar networks.
Individual Level |
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Conventional (amplitude correlation)a |
Amplitude envelope correlationb |
Instantaneous phase correlationc |
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Mean (S.D.) | Range | Mean (S.D.) | Range | Mean (S.D.) | Range | |
Total edge weight | 53.69 (4.51) | 45.75–64.55 | 31.54 (2.18) | 27.71–36.47 | 21.67 (2.13) | 16.52–27.41 |
Average edge weight (connected)d | 0.31 (0.03) | 0.25–0.39 | 0.18 (0.01) | 0.16–0.21 | 0.12 (0.01) | 0.1–0.16 |
Average edge weight (all cells)e | 0.16 (0.01) | 0.13–0.19 | 0.09 (0.01) | 0.08–0.11 | 0.06 (0.01) | 0.05–0.08 |
Maximum edge weight | 1.12 (0.23) | 0.79–2.21 | 0.81 (0.51) | 0.54–3.94 | 0.57 (0.22) | 0.36–1.87 |
Intrapair Differences | ||||||
Spearman’s Rho | p-value | Spearman’s Rho | p-value | Spearman’s Rho | p-value | |
Total edge weight | −0.14 | 0.5 | 0.09 | 0.66 | 0.25 | 0.25 |
Average edge weight (connected) | −0.17 | 0.42 | 0.28 | 0.19 | 0.25 | 0.25 |
Average edge weight (all cells) | −0.38 | 0.07 | 0.15 | 0.48 | −0.07 | 0.73 |
Maximum edge weight | −0.14 | 0.5 | 0.09 | 0.66 | 0.25 | 0.25 |
Three different approaches were used to build fMRI connectivity networks. First, the amplitude correlation method for band-passed low-frequency oscillations24 (a) afterward, the Hilbert-transformed signal allowed extracting the amplitude envelope (b) and the instantaneous phase (c) correlation methods28,26. The results indicate edge weights considering both the connected network component, removing all zero entries of the matrix (d), and all edges accounting for the zeroed matrix entries (e). S.D., standard deviation.