I pretty firmly believe in some form of reincarnation or a transfer of memory/experience. I had my own un-intentional regression when I was 14 (about 10 years ago now) and it made a lot of my childhood traumas make more sense. It could be all just an intense dream, but there are memories and feelings that come up now and then that are much stronger than my dreams ever are.
Another indication (perhaps coincidence?) that adds a twist to the validity of my story is that in this previous life I died after being shot in the back - mid back around vertebrae T8 or so. This time around I have scoliosis that originates from T8 or so. I don't really know what to make of that. There are so many ways of looking at what I have experienced . I am not going into much detail here, because it is something that I highly value and is very personal.
Suffice to say - I don't think that there is any scientific explanation for some of my memories, but that does not discount the validity of them. They are still very real.