Clusters and ROI

I'm not sure how an electrode can be attributed to the recording of the hippocampus.
You have to be careful with attribution of EEG electrode=brain region. EEG scalp potentials are very smooth, due to the skull and the diffusion of the currents in the head tissues. Some EEG features visible on most of the electrodes (eg. P300) can't be attributed to a single brain region.

I would like to calculate the connectivity matrix between these clusters. Is that possible in BrainStorm?

I replied to your other post: