EEG signals constitute one efficient recording of the brain electrical activity using electrodes that could be placed on the scalp according to specific configuration. Several studies dealing with electrodes configuration effect on electrical activity localization were carried over the entire scalp surface with one symmetrical and uniform manner. By considering configuration dependence, one could notice the following problems: large number of electrodes and high cost of EEG equipments as well as manipulation and computational time. \nIn this paper, we propose a novel approach for cerebral electrical activity localization based on electrodes configuration by using separately each specific brain lobe: the frontal, the occipital, the parietal as well as the temporal lobe. The a priori information on the pathology area provided by the clinician could be indeed essential. In order to reconstruct the cortical generators in the brain from the recorded EEG signals, various generalized inverse problem methods were developed. To validate our approach, Standardized Shrinking LORETA-FOCUSS (SSLOFO) method was explored carefully in order to be compared. Experimental results showed that even with a small number of electrodes placed at specific lobes, we obtain similar localization results compared to the 128-standard configuration. This could yield multiple benefits such as time computational gain for the overall algorithm and electrodes efficient placement on the scalp. Using a priori clinical information, one could notice also time gain during electrodes placement as well as practical usefulness for cortical generators localization.

Login to Download PDF

Please login with your Paper ID and password to access the full PDF.

🔑 Login to Download