There are questions about the general efficacy of measuring brainwaves I'm afraid this underestimates the case somewhat. As I wrote in another comment, people

There are questions about the general efficacy of measuring brainwaves I'm afraid this underestimates the case somewhat. As I wrote in another comment, people in the field have been very frank with me in their total distrust of toy systems like Neurosky. Anyone claiming to track moods or mind states right now is hugely overstating their capabilities. I like the idea as much as the next guy, but at the present it's not questionable, it's simply impossible. We don't have the tools or the data with which to adequately apply them.