MEG-based imaging of focal neuronal current sources

The authors describe a new approach to imaging neuronal currents from measurements of the magnetoencephalogram (MEG) associated with sensory, motor, or cognitive brain activation. Previous approaches to this problem have concentrated on the use of weighted minimum norm inverse methods. While these methods ensure a unique solution, they do not introduce information specific to the MEG inverse problem, often producing overly smoothed solutions and exhibiting severe sensitivity to noise. The authors describe a Bayesian formulation of the inverse problem in which a Gibbs prior is constructed to reflect the sparse focal nature of the current sources. The authors demonstrate the method with simulated and experimental phantom data, comparing its performance with several weighted minimum norm methods