The electrically agitated brain is faster. At least it serves to remember more words than normal for a certain time.
The current is very small. In fact, only a current of two milliamps is needed to help activate the brain, hundred times less than a household electrical appliance needs.
A group of neurologists from Maryland conducted the experiment with 103 patients. Each patient takes twenty minutes to insert the electrodes into the head and then asks him to say the words that start in a time interval with a certain letter.
In experiments without electric current, patients remembered about twenty words in ninety seconds. However, by applying the current they were able to remember four more words on average, which means an improvement of 20%.