Brian, I've definitely mulled this over periodically over the years. While I remember "past" lives as if they were linearly in the past, it comes with a strong sensation of it not really being the "past." So my cognitive functioning doesn't match my intuition on the matter. This all gets quite complicated when I try to sort out the information from the "past" and what it would mean if it were really simultaneously occurring or is in the "future," given my particular set of "memories." I'm pretty sure some of the other memories are of myself, but I've also always had complicated dreams and visions of many other places and events, most of which I do not think had anything to do with me. It's a different feeling I get when I feel like I'm exploring some other person's life/place. Ultimately, however, I don't think anybody is really themselves but part of a broader process as a whole... so those distinctions are only meaningful to me at this moment, perhaps?