This script builds a parcellation that allows to map EEG data to surface. ! Spatial resolution is highly limited ! This is only an approximation that allows for easy visualization and does not require MRI. Uses a closest electrode approach to create parcels. Script originally written for LEMON data - 61 electrodes in 2010 space. Maps to fsaverage5.
Parcellation:
EEG mapped to labels:
Below are two uncertainty maps (i.e., distance to assigned electrode within each parcel). Upper panel shows relative values normalized to maximum distance to assigned electrode, lower panel shows absolute values.
When correcting for uncertainty (map * (1-relative distance)), results follow a slightly different but plausible pattern:
