Yes, I can be out dated but even that and even your information you don’t answer yet where is the electrical source of the human been, not neuro-transmitters or nervous terminations and the like but the electrical source: from where is developed.
Not sure what you are getting at (the electrical source). The power source is chemical. Signalling is electrical, electro-chemical and chemical.
The brain is not very good at multi-tasking, not even your wife's no matter what she tells you. Reducing sensory input in one area allows focus in another area. It is why people to tell you to shut up when golfing, even though swinging a club is not an auditory action.