This experiment took place in a 'science salon' in Tokyo.
These comparison graphs represent my own brain waves, recorded and measured during two separate segments of one minute each in duration.
The object of the experiment was to determine the amount of time spent in each brain wave state and to compare the overall effects of normal relaxation with the same amount of time spent overtone singing. Theta waves are the deepest here (delta being deeper, but only present during sleep).
The figures in the count column (number of seconds) suggest that more time is spent in deeper brain wave states during overtoning than in ordinary relaxation. The most pronounced difference is in the amount of time spent in beta waves.
The bottom chart represents the levels of concentration and relaxation in both cases, with the highest possible score being 200. The higher the number of points, the greater the level of concentration or relaxation. The results show a significant overall increase in both states while overtone singing. While starting out approximately with the same concentration level both times, there is an opposite trend in concentration during the second half, which increased dramatically in the case of overtone singing. It is interesting to note a deeper level of relaxation while overtone singing as opposed to that of an ordinary relaxed state.
The analysis of the overtone singing segment describes this as a highly meditative, healthy and stable state, with strong energy to rid oneself of stress.
