Robert Monroe created the Hemi-sync technology in the 1970's to achieve more productive states of focused awareness. Much of what we know about the right and left hemispheres of the brain began with the research of Robert Monroe.
Hemi-sync uses audio sounds which entrain the brain to move into a very productive state of hemisheric synchronization. The beauty is, the system works even while you do. You can actually use the cd's while you work. The Hemi-sync has been orchestrated to achieve many different things:
Relaxation
Sleep
Creativity
Improved mental and physical health
Improved performance in any endavor
Enhanced learning and retention