Not familiar with that one, interesting idea though.
It makes me wonder, just how much investigation has been carried out in relation to past life regression? You hear about instances of it, someone has lived as a roundhead in another life, or as a peasant in a mediaeval era etc. So which part of the brain is being communicated with in the hypnotic state?! It can't therefore be the subconscious, as that deals with the aspects of our lives that we see and feel everyday but don't realise it. There must be something deeper that remains hidden, but can be awakened on occasion.