Mean phase difference between electrode pairs, averaged across all the electrode
pairs within a distance range. Same format and analysis interval as Figure 4. For the bipolar reference scheme, the distance
ranges for which the referenced signals share a common component
(0.22 and 0.4 mm) are shown in dashed and
dashed-dotted blue lines. Distance range 0.4 mm with no shared common component is
shown as a thicker solid blue line. For the CSD reference scheme, the distance ranges
for which the referenced signals share a common component (0.4,
0.42 and 0.8 mm) are shown in thicker lines.
For the bipolar reference, the phase difference due to the deterministic component
could be either 0 or depending on how the signal is referenced (e.g., if the voltages recorded from three
nearby electrodes are V1, V2, and V3, the bipolar referenced signals could be BP1 =
V1-V2 and BP2 = V2-V3, which would produce a phase difference of ; or it could be BP1 = V1-V2 and BP2 =
V3-V2, which would produce a phase difference of 0). For CSD, the phase difference at
0.4 mm is because CSD at electrode 1 has a V1-V2/4
term while CSD at electrode 2 has a V2-V1/4 term. Electrodes separated by
0.42 and 0.8 mm share two or one neighbors,
respectively, so their CSDs have a common component that leads to a phase difference
of 0. If we ignore these special cases, phase differences for the remaining electrode
pairs show a random value (thin lines in C and D) and high circular standard deviation
(Figures 6C and D), suggesting that phase
differences are random.
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