Fundamental Research on Cortical Activity Visualization

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Artificial neural networks can be exploited to solve inverse problems arising from the visualization of neural activities in the brain. In this research, we made use of the network inversion techniques for solving inverse problems with special attention directed towards electroencephalographic dipole localization and the improvement of positron emission tomography. In **r regluarized network inversion technique, for stabilizing the solution, we explicitly include the a priori knowledge by adding penalty terms to the energy function and/or build this knowledge into the architecture of the multi-layered neural networks that are to be used as an inverse problem solver.In the electroencephalogram analysis, the consensus term added to the energy function facilitated S-dipole localization for visually evoked potentials. Effectiveness of our regularization technique is shown in improving the positron emission tomogrgphic images and for generating metabolic images of the brain, under the constraints given by the a priori knowledge inherent to the measurement systems and physiological rules.