I agree; Sheldrake and Hancock for example admit that the brain is involved. It also goes beyond the brain, even during embodied life. It can exist without the brain, which may depend on whether the spirit is incarnate or not. To function in this dense realm, the soul needs the body and the brain, which is its control center and antenna. There are the akashic records too, which are the record that the universe keeps of everything that goes on. I am not an expert on this; a field worth further inquiry. Many spiritual readers access the akashic records. I am open to all these phenomena, even if to finally know them to be true and real myself, I need more evidence or experience than I presently have.
More-etheric realms are not separate from more-dense realms; that would be an inaccurate interpretation of what I am saying. Spirit is everywhere, always and equally present in this life continuum.