[walter_bishop]

"How does the brain produce conscious experience? How can neurons firing give rise to experiences of colour, sound, taste, pain and so on? In principle, scientists could map my brain processes in complete detail but, it seems, they could never detect my experiences themselves – the way colours look, pain feels and so on: the phenomenal properties of the brain states involved. Somehow, it seems, brain processes acquire a subjective aspect, which is invisible to science. How can we possibly explain this?"

What you refer to as 'conscious experience' is an emergent property of processes in the brain in communication with one another. The 'subjective aspect' is an internal recreation of the external world, continuously updated from data provided through the senses. Ergo, no need to go invoking some invisible undetectable subatomic substance, the phlogiston of the mind.