Follow-Up:
Sounds like an extremely old philosophical discussion about the mind/body dualism. Kayla sounds like a dualist- the mind and body (or brain) are separate entities. I'm almost certainly a monist -the mind and body are the same and inseparable. The funny thing about that is that I will never find out that I'm right because if I am the instant I 'die' I will cease to exist (now there's a bit of existentialist terror). I will only ever be able to find out that I'm wrong because then my mind will continue to exist after my bodily death. I'll think to myself "oh well, I got that one wrong- still I'm not too unhappy about it". I have however never heard of this four entity theory?