Having worked with and perfected binaural beat recordings for over 25 years now, I can honestly say that this may be a very complex chicken or egg type of question. Clinical studies that I have been involved in have shown that brainwaves can be effected through binaural beat stimulus. These studies wired subjects to EEG (brainwave measuring devices) to ascertain whether or not the stimulus (the sounds) directly and proportionately equalled the brainwaves being measured. The answer was yes and no. Many times, the subjects brainwaves would be equivalent. For instance, when listening to delta frequencies, the subject’s data would show an increase in delta brainwave activity. The same applied for frequencies within the other bandwidths.