Well, I believe that our bodies are simply machines-- earth suits if you will, perfectly suited for this planet, so that our spirits, which have no mass and do not exist in space/time, can express themselves.
So you're talking about a non-physical entity expressing itself through a series of peripherals, (eye working as camera to transmit images to spirit), ears to transmit sound, touch taste, legs to move spirit from place to place, etc.
So, where does the interaction, the interface take place between the physical world and the non-physical? Where does the proto-thought become the thought? Fine question, and I wish I knew the answer to that, but there are so many things we don't know I'll just have to put that on the list.
I heard a woman one day speculating that memory was located in ever cell of the body, but that is nonsense- since your arms and legs can be lost, and your head could basically be kept alive in a dish if blood/oxygen/glucose were supplied to it. So the mechanism is to be found in the brain. Parts of the brain can be removed without causing a seperation of spirit/body, so I imagine it is located in a section outside of those?
As far as I know, no scientist has ever explored this, in a surgical way.
Kind of hard to get volunteers for that kind of experiment.
...our spirits, which have no mass and do not exist in space/time...
I simply don't know what this means. Sorry.