There really is a big debate that there is no free will,
I believe for the most part that is correct. There is some free will but very little.
I consider that the brain is involved in conscious mind activity with about 1% of its capacity. All the rest is unconscious mind whether its digesting a particular food or planning ahead for its next challenge with its enviorment.

You really have been following what I have gotten on about micro tubuels. The connection with the limbic system is my own guess work however.