In his fascinating book, “Proof of Heaven – A Neurosurgeon’s Journey into the Afterlife”,by Dr. Eben Alexander describes having “conscious experiences” during the time he was lying in a hospital room in a deep coma for seven days. In medicine, a coma ( meaning “deep sleep”) is a state of unconsciousness lasting more than six hours (source: Weyhenmyeye, James A.; Eve A. Gallman (2007). Rapid Review Neuroscience 1st Ed. Mosby Elsevier. pp. 177–9).
He also postulates on the possibility of the benefits of Hemi Sync for severe coma patients.
Hemi-Sync (or “Hemispheric Synchronization”) also known as brainwave synchronization is a technique which synchronizes the two hemispheres of one’s brain, thereby creating a ‘frequency-following response’ designed to evoke certain effects. Hemi-Sync has been used for many purposes, including relaxation and sleep induction, learning and memory aids, helping those with physical and mental difficulties, and reaching altered states of consciousness through the use of sound.
See video: Hemi -Sync with Delta, Alpha and Beta, and Gamma Using Chimes, Bells, bowls and birds http://www.youtube.com/watch?v=sXL4GoLyAis
See also: Hemi Sync OM the reverberation of source (Alpha) http://www.youtube.com/watch?v=0_olxDRXv2s
“In my journey to understanding after my coma, Hemi Sync potentially offered a means of inactivating the filtering function of the physical brain by globally synchronizing my neo-cortical electrical activity”, he said (pg 159).
“Hemi Sync can heighten selective awareness and performance through creation of a relaxed state. Hemi Sync offers much more than this however – enhanced states of consciousness allow access to alternative perceptual modes , including deep meditative and mystical states”, said Dr. Eben Alexander MD (pg 158).
See also video: How Dr. Eben Alexander’s experience Affected his life – Oprah http://www.youtube.com/watch?v=KqvHUH_i_t4