Recently, mental diseases have been successfully treated by neuro-feedback therapy based on Quantitative EEG (QEEG) and Event Related Potential (ERP) online data measurements. The U.S. Food and Drug Administration (FDA) approved the first EEG test for diagnosing attention deficit hyperactivity disorder (ADHD) in 2013 [1]. The EEG signals are measured by an EEG cap and analyzed by a high performance computer to extract not only the EEG power at a predetermined frequency and site combinations, but also the degree of coherence between all sites. Based on these results, brain stimulation is performed to modulate brain rhythms (EEG) toward the normal values for the therapy.