I have a question regarding the scout function in terms of the Phase Locking Value calculation.
I want to investigate the PLVs in two different networks. First, I use the 68 ROI of the Desikan Kiliany Atlas and second, I use 14 ROI which are also regions of the Desikan Kiliany Atlas but serve as a subnetwork of the whole brain.
For each participant, I calculated the sources over four segments, calculate the PLV for each segment and average the four PLV matrices in the end.
Now, I am wondering why the PLV values of the 14 ROI PLV matrix differ from the same 14 regions included in the 68 ROI matrix. In the PLV setting a used the setting “when to apply scout function: before”. The question is, why do the values differ although the underlying sources are the same?
Thanks in advance for the help!