Hemispheric Synchronisation as Trance-Induction Technique
I utilize hemi-Sync® as an efficient and most valuable method of inducing deep trance-states for shamanizing and other practical works like OOBEs. Hemi-Sync® was invented, researched by Robert Monroe and is still being improved in the Monroe Institutes (TMI). The founder of the institue, Robert Monroe himself, wrote three books about his experiences with "Out of Body Experiences" (OOBE - he invented the term) and his thoughts and conclusions about what he experienced since the 50's. His three books are: "Journeys Out Of The Body", "Far Journeys" and "Ultimate Journey". Monroe managed to use Hemi-Sync® to induce controlled altered states of consciousness that are required for OOBEs.
Hemi-Sync® is a certain acoustic trance-induction technique that become possible with modern methods of playback and reproduction in stereo. Monroe discovered various different states of consciousness that can be reached by acoustical hemispheric synchronisation. At the beginning you need the Hemi-Sync® tracks that induce the various "Focus-states" and to learn the procedure of reaching them. With sufficient training you can reach these altered states without the technical cruch, which is only one goal of the whole Hemi-Sync® technique. The technical and physiological backgrounds of this trance-technique is explained on the website of the TMI. It would lead to far away trying to explain all of it here.
The synchronisation of both hemispheres of the brain can be achieved by using slightly different frequencies at the right and the left ear. For example, you hear with your right ear a frequency of 200 Hertz in your headset and your left ear hears a frequency of 204 Hertz. The difference of 4 Hertz can be heard as an oscillation because your brain tries to harmonize both frequencies. The effect results in a synchronized brain. The easiest state of synchronized trance is named "Focus 3" - both hemispheres are synchronized. "Focus 10" is the first important trance-state to us. It is characterized by your body asleep and your mind wake and alert. There are many deeper trance-states also relevant for shamanic works - I have described them in my book, which I sometimes publish in english, too. In all of them at least I cannot move any limb or other part of my body.