Some of us have stronger and completer race memories than others.
It is all a question of varying degree of possession of the other-personality.

In myself, the degree of possession is enormous.

My other-personality is almost equal in power with my own personality.

And in this matter I am, as I said, a freak--a freak of heredity.
I do believe that it is the possession of this other-personality--but not so strong a one as mine--that has in some few others given rise to belief in personal reincarnation experiences.

It is very plausible to such people, a most convincing hypothesis.