Here is a site offering some insight to the doctrine
http://www.butte.cc.ca.us/~wmwu/inclass ... n_soul.htm
You may also want to read:
Reincarnation Five Keys to Past Lives Safe and Effective Techniques for Recalling Previous Existences by Brennan, J. H.
“ The Soul and the Second Body
Anata means ‘no soul’ and classic Buddhism teaches that while individuals are trapped in the recurring wheel of birth Death and rebirth, they do not in fact possess souls.
…Buddhists deny a permanent individual spirit altogether…. The mind and the personality is created anew each time [a new life is formed], as are the subtle bodies. There is, as the Buddha taught, no soul which passes from body to body. Instead there is a vast and complex pre-existent entity (yourself) which creates the situation leading to the reincarnation chain. [a new chain is created as a link to a physical body with which to experience the prime material, death severs this chain, thusly to experience the physical plane again a new chain must be created.]
At a certain point in the process, the Essential You may decide to permit the filtering down of past life memories in order that the learning process may proceed more efficiently.”
This doctrine states that the traumatic process of death and birth affect recollection of past life memories.
I do however find this theory interesting and worthy of further exploration, as it seems to have fallen thru the cracks of time.