Electromagnetic imaging of dynamic brain activity

Neural activity in the brain produces weak dynamic electromagnetic fields that can be measured by an array of sensors. Using a spatiotemporal modeling framework, a novel approach to localization of multiple neural sources has been developed. This approach is based on the MUSIC algorithm originally developed for estimating the direction of arrival of signals impinging on a sensor array. The authors present applications of this technique to magnetic field measurements of a phantom and of a human evoked somatosensory response. The results of the somatosensory localization are mapped onto the brain anatomy obtained from magnetic resonance images.<>