The electroencephalogram (EEG) has been widely used in research and medicine for more than eighty years. The ability to measure the electric activity in the brain by means of electrodes on the head is a handy tool to study brain functions as it is noninvasive and easy to apply. However, the interpretation of the EEG signals remains difficult. The main reason for this is that the exact relationship between the activities generated in the brain to that measured on the scalp is unclear... 
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