Neuroscience is a subject of interest to me, and I subscribe to a couple of neuroscience blogs on Tumblr. They are both quite active.
I also just read the Robert Ornstein book, “The Evolution of Consciousness” which explores the subject in some detail.
While contemporary neuroscience, like contemporary cosmology and astrophysics, can’t tell us everything about how our little “3-pound universes” work, we are gaining more and more knowledge of these things on an ongoing basis.
It’s been said that we’ve learned more about brain function in the last 10 years than we have in all of previous history.
In all of that, I’ve never seen even the slightest indication that anything other than the electrochemical activity of “The most complex stuff in the universe” is necessary to explain consciousness.
To all evidence it’s tied inextricably to the activity of the brain, which is easily demonstrated by the profound effects on consciousness that occur when one tampers with or damages the brain.
Damage this area...That bit of function is lost. Stimulate that area, a memory may be reliably elicited. Introduce psychoactive chemicals, and predictable effects occur. Alter the brain’s internal chemical balances even slightly, and profound effects may occur. Just drop the blood-sugar level a few points and the person becomes incoherent, confused, and eventually unconscious.
The overall solution to the so-called “hard problem” of consciousness may be as knotty as is the nature of the Dark Matter.... But it’s in the area of neuroscience that it will be sussed out, not spiritual mumbo-jumbo.