Well, I'm not sure exactly. I have felt that if the mind exists in someway separate from the brain or body than that is what soul is. I feel less sure of having a soul all the time. I definitely feel that I am a self, but the older I get the more I feel that myself and my body are the same. When I think of it, this is how I remember feeling as a child -- all of me, toes, knees, belly, nose and hair -- all me, inseparable from the thinking.
There is an interesting book by Candace Pert, Ph.D. called Molecules of Emotion: The science behind mind-body medicine
. She is a bit crazy, but the book was terrific. It's been quite awhile since I read it. Pert contends that emotions come from all over our bodies. the title captures it -- the molecules that are the start point for emotions are all over our bodies. Thinking and emotion are intimately linked, therefore one of Pert's ideas is that the whole body is involved in what we normal associate as happening in the brain. I think I got this right -- now I need to go back to the book, see if I'm off in my remembering.