MEG and EEG data fusion: simultaneous localisation of face-evoked responses.

ABSTRACT: We present an empirical Bayesian scheme for distributed multimodal inversion of electromagnetic forward models of EEG and MEG signals. We used a generative model with common source activity and separate error components for each modality. Under this scheme, the weightings of error for each modality, relative to source components, are estimated automatically from the data, by optimising the model-evidence. This obviates the need for arbitrary user-defined weightings. To evaluate the scheme, we acquired three types of data simultaneously from twelve participants: total magnetic flux (as recorded by 102 magnetometers), orthogonal in-plane gradients of the magnetic field (as recorded by 204 planar gradiometers) and voltage differences in the electrical field (recorded by 70 electrodes). We ass

SUBMITTER: Henson RN 

PROVIDER: S-EPMC2912501 | biostudies-literature | 2009 Aug

REPOSITORIES: biostudies-literature