Do you wonder how we measure brain activity? Our brains communicate through the cell sending tiny electric signals to each other and the more signals the more electricity it will produce. An EEG can measure the pattern of this electrical activity. There are some who believe that if we stimulate certain part of the brain (pre-frontal cortex) will improve certain functions. For years, there had been experiments of stimulating the brain using small electric currents and see if it can make us thinker better or smarter.