Optimising experimental design for MEG connectivity measurements

Introduction Dynamic imaging of coherent sources (DICS) (Gross et al., 2001) employs a cross power spectral density (cpsd) matrix to act as a spatial filter in the frequency domain in contrast to other beamformer techniques which use covariance. Conclusions Results presented show that both power reconstruction and coherence estimation made using DICS is affected by the total amount of data (information) recorded. Since the amount of information also depends on the signal bandwidth, these effects would worsen if the bandwidth was decreased (to e.g. alpha, beta band etc.).