Ahh, that explains it. When you used the word 'mind', I was assuming you were talking about non-physical 'parts'. (I consider mind and brain to be distinct but related phenomena.) Hesper provided a good quote giving Carpenter's reasoning. I'd just add that according to my understanding, preconscious prehension is also 'pre-physical'. It is non-physical mind that does the scanning, and then non-physical mind that spurs the physical organism into action (the 'artist' phase described in my post). The action of mind on the brain is a "first act", i.e. PK. So like he says, there may be a neurophysiological correlate to this influence of mind on brain, but research hasn't been done yet. I have a hunch it might be better to look for it in more holistic brain activity (like the Conscious: Anatomy of the Soul guys do) as opposed to distinct brain regions.
I was thinking of this:
Dec. 21 1996:
Q: (A) Which part of a human extends into 4th density?
A: That which is effected by pituitary gland.
Q: (L) And what is that?
April 15 2000:
A: No. Stones were once utilized to provide for all needs, as the energies transmitted connected directly with the pituitary gland to connect spiritual realities with the material realms of 3rd and 4th densities.