Brain Training Graphic (IMAGE) Johns Hopkins University Caption EEGs taken before and after the training showed that the biggest changes occurred in the brains of the group that trained using the "dual n-back" method. Credit Kara J. Blacker/JHU Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.