Planes instead of Densities

[anagogy]

Well our brain does have a function. We can lose awareness if something happens to our brain.

In much the same way as your vision is distorted if your sunglasses are cracked or smudged, your consciousness will be similarly distorted if the lens of your brain is damaged. If you were communicating with someone via a computer system and the computer was damaged all input and output via that mechanism would be damaged/distorted as well. The person is not damaged in these examples, merely the machinery facilitating accurate perception/communication.

Also, if you read 47.8 it may become more clear to you that
Astral (emotional) = 4th Density
Mental (deva) = 5th
Etheric = 6th
Buddha/Soul = 7th

While this is certainly a logical conclusion to come to as a result of that section, I'm not quite sure it is so cut and dry. Afterall, Ra has also stated that there are both space/time and time/space experiences in higher densities which would seem to imply that there are definite physical experiences at those levels. They have also stated that genetic heritage continues to hold sway into fourth density, and that certain parts of our brains will have more use in the next density and so on. This seems to imply to me that there is more to it than that 4th density equals the astral world and so on (unless we drastically expand these occult words to encompass certain types of physicality as well, but generally in most occult literature these terms are used to refer to higher and higher gradations of nonphysical energy). And occasionally fourth density beings, such as the orions, physically land on our physical vibrational level, and tangibly bring 3rd density beings and probably occasionally 2nd density beings aboard their craft to experiment upon.  Also consider that there are nonphysical versions of orange and yellow ray activation at death as evidenced by the questions regarding ghosts which implies that even these rays are not wholly physical in and of themselves (though they can certainly express in the physical as we are witnessing right now). Anyway, I'm not necessarily saying you are wrong, just that I think these things are worth considering when coming to such conclusions.

I think we can agree that it is, at the very least, an interesting and fascinating topic (one of my favorite topics in the Ra material) full of interesting mental mysteries to divulge. I've always been fascinated with the different layers of vibrational consciousness that make up the mind/body/spirit complex.