[andai]

Neurofeedback isn't quite the same thing as neuro-stimulation. Neurofeedback just encourages (through positive feedback) the brain to stimulate itself :)

I've been practicing meditation for a few years and it has slowly but steadily improved my ability to concentrate. (Also worth mentioning that witnessing emotions as a field of sensation allows them to "dissolve" instead of getting stuck, and has helped me overcome various addictions and roadblocks.)

Meditation was shown to develop the prefrontal cortex (involved in decision-making, working memory, inhibition, emotional regulation..), which is (are) underdeveloped in people with ADHD.

I'm wondering how this kind of independent, willpower based practice compares with the constant external feedback of neurofeedback training, seeing as one of the main deficits in ADHD is self-motivation. My guess is that a combination might be most effective: train the concentrated state itself to make it more accessible, and then train the will (habit) to access it.

Or put another way, make use of both internal and external technology :)