Here's my brief take on the mind-brain connection as given in the book of Genesis:
"And the earth was without form, and void; and darkness was upon the face of the deep. And the Spirit of God moved upon the face of the waters."
Deep in the mystery of Its own being, Spirit desires to know Itself.
"And God said, Let there be light: and there was light."
Consciousness - Mind - being the primary attribute of Spirit, shines forth.
"And God saw the light, that it was good."
Mind is the Cosmic watcher that discerns and thinks about what Spirit (God) observes..... later,
"So God created man in His own image; in the image of God He created him; male and female He created them."
Humankind is first created so as to be like God the Mother-Father, that is, as Spirit, perfect, whole, containing within itself both the masculine yang energies of action, focus, outward directed action, mind, and the female yin energies of receptivity, birth, manifestation, nature, which in balance are referred to in traditional Chinese philosophy as yinyang.
" 1) yinyang as the coherent fabric of nature and mind, exhibited in all existence, (2) yinyang as jiao (interaction) between the waxing and waning of the cosmic and human realms, and (3) yinyang as a process of harmonization ensuring a constant, dynamic balance of all things."
(Internet encyclopedia of philosophy at http://www.iep.utm.edu/yinyang/)
Spirit awakened to itself is the consciousness of God, or Mind. That is our heritage, our birthright, this connection with, and participation in God-MIND.
Each of us is a tiny spark of that Divine Light that "was good". It is that spark in us that gives us our creativity and imagination. Brain is but a tool.
It was only after humanity 'fell', that is, got stuck in the physical, that we needed a brain.
There is, in fact, strong scientific evidence that consciousness and intelligence (that is, what we think of as mind) can function with very little brain, or even independently of the brain. There are documented and well-researched cases of individuals with severe brain damage or hydr0cephalus but normal mental function, and near death experiences has also been reported where a person with a completely disabled brain was, on another level, fully conscious and mentally functional. Which goes to show that the brain-tool is neither the origin of mind or consciousness, nor necessary for the activity of mind.
Brain, being a physical attribute, enables us to interact meaningfully with the physical body and physical environment. For that purpose, brain generates ego, a mental creation meant to help us function in the material world.
Ego was not intended to usurp the guiding role of Spirit, but its outward-facing nature is so strong as to delude ego into believing in its own primacy, and into distancing itself from Spirit. It is our over-reliance on brain and its child - ego - that have deceived us into believing that that ego is the true us. It is NOT, of course, but we have given to the brain-born ego enormous power and influence way beyond its true function. It must be brought back under the guiding influence of the higher MIND.