Delmar, here's one time when I have to disagree with you. Brains are not spiritual or soulical (if you'll allow that word), brains are physical, made up of atoms and molecules. Awareness is a non-physical attribute. Trees don't have awareness because they don't have souls or spirits. Atoms and molecules, no matter how complexly arranged, cannot have awareness. That requires a something non-physical. Knowledge, wisdom, pain, these are all non-physical.
Our brain is less like a computer than it is like a telecom switch, it is an interface to our soul/spirit. Our awareness, understanding, all that non-physical comprehension occurs in our soul/spirit, and our brain functions as the super high-bandwidth interface to our soul/spirit.
A PC has a brain (a microprocessor), but does not and cannot have awareness. If you enginered and grafted a brain onto a plant, it would not have awareness. You'd have to give it a soul/spirit to be aware.
-Bob