My brain is a chemical computer, but more than the computer in front of me or you. I control it almost as much as you or I control our electronic computers. So how do you control brain chemistry - with your thoughts? I don't think so.-Unless you are arguing for a stark dualism of mind and matter being separate, then you have to provide some evidence for this position.-> My brain use is not independent of the brain chemistry, but also not controlled by it.-I would beg to differ here. Of course there are environmental aspects, mechanical and perhaps quantum phenomena occurring in your brain. I would argue that you are controlling none of these in any meaningful sense of the word control.