A New Combining Approach to Localizing the EEG Activity in the Brain: WMN and LORETA Solution

Estimation of cerebral electric activity from the scalp electroencephalogram EEG requires a solution to the EEG inverse problem. We propose a new approach which consists in combining two methods in order to locate the brain electric activity: ´Weighted Minimum Norm´ ´WMN´ and ´LOw Resolution brain Electromagnetic TomogrAphy´ ´LORETA´. The idea that we propose is to used the current density distribution estimated by the WMN method in order to initialize the LORETA method. A comparative study of three different inverse methods, WMN, LORETA and WMN-LORETA is presented. We compare the results found with existing methods LORETA and WMN. The results reveal that WMN-LORETA is able to reconstruct a three-dimensional source distribution with a degree of localization compared to the other methods.