Consciousness begins in the "sub-conscious" part of the mind. That is where all animals except man are stuck, except for brief moments when an animal seems to use reason, such as when a dog gets help for his master who fell in a hole.
Loren Eiseley called this animal state of mind "the eternal present." Ayn Rand called it "range of the moment," lasting only as long as the moment requires, then reverts back to being entirely sub-conscious.
Psycho-epistemological intuition begins there too. When it arrives at the front consciousness like a lit light bulb, it's because the sub-conscious was either working it previously; or because it connected instantly something it knew with what you were trying to find or answer.
"Intuition: (Lat. intuere, to look at) The direct and immediate apprehension by a knowing subject of itself, of its conscious states, of other minds, of an external world, of universals, of values or of rational truths."
Such "apprehensions" come to you because of your psychology, dependent on your epistemology and your sense-of-life; hence the name "psycho-epistemological" intuition.
Creativity and imagination are also begun in your sub-consciousness, brought forward by the needs of your work.
" We may now proceed to apply this method of isomorphism. There are two theories to explain certain psychological phenomena called the phenomena of the subconscious. One of these is that there is a consciousness performing all the acts of intelligence which are called subconscious; the other theory states that these acts are the results of an unconscious intelligence, which consists of purely physiological processes. It appears from the latter of the two above-mentioned theories that there is no essential difference between the properties of the unconscious intelligence and those of consciousness. Certain facts from my own personal experience prove that, at least in my own case, this "unconscious intelligence" can both read and remember. In March, 1911, while walking along a street, I suddenly began thinking about Virgil's Aeneid, and my attention became fixed on the expression "alma Venus" that I then remembered having read in that poem. In that expression I thought particularly on the meaning of the first word. After a few minutes (while I was still on the same block) I began wondering why I thought about that expression so suddenly. Looking around, I discovered that, among the things in the field of vision that I had not noticed was an apartment house called "The Alma." I certainly had no knowledge of the process which I know must have occurred, namely, the reading of the word, the memory that it was Latin, and the memory of the particular expression in which it occurred. Since, therefore, this process had occurred, and it was not within my consciousness, it was evidently a subconscious process. Accordingly, the "unconscious intelligence" within my brain can read and remember, and furthermore, it can remember for half a year, since it had been that time since I had seen that passage from Virgil."
Boris Sidis, Ph.D., M.D. Boston: Badger, 1914
No where could I find which physiological parts of the brain contain the sub-concsiousness. I am presuming that it is an interconnected system using both the left and right hemispheres, and we know from experience that a lobotomy seems to cause one to lose connection with his/her creative nature.
So perhaps it is the pre-frontal cortex that controls all of the inter-connectivity.