Thought I'd share this since I did some research last night. And this doesn't really cover much so if anyone has anything to add please do. Oh, and don't overlook the benefits of it in neurofeedback, it works really well. Here's an article with the basics: www.crossroadsinstitute.org/ to show you that they're doing it in children and an overview of the actually procedure http://www.childrenshospital.org/health-topics/procedures/electroencephalograms http://neurodevelopmentcenter.com/neurofeedback-2/qeeg/ Here's NYU saying that QEEG "As an adjunct to the clinical evaluation, a neurometric QEEG has direct implications for optimizing treatment of neuropsychiatric and cognitive disorders, and prediction of the evolution of disorders, such as dementia). " http://www.medication.nyu.edu/brl/research/current/qeeg_innovation.html Bottom line in my humble opinion, if you've done everything else and still no diagnosis or idea what's going on with your difficult child, this can't hurt and might really help.