Estimating true brain connectivity from EEG/MEG data invariant to linear and static transformations in sensor space

► Construction of brain connectivity measures invariant to linear transformations. ► Development of a theoretical framework and derivation of new multivariate measures. ► Relationship to existing approaches in the literature. ► Application on EEG data and combined EEG/MEG measurements. ► MEG observed brain interactions that were not observable in EEG.