The neural pathways inside the human body are not that far off from the electrical wiring in the family home. You have some areas of a house that have more wiring than others. You also have areas in the house where there is less wiring than others because it isn't needed.
The human body, like a home, sends electricity throughout the body. The charge is smaller and in the form of short electrical bursts, but the idea is the same.
Your body also has times when an area goes dark. In the human body this is mostly associated with injury. Unfortunately unlike a home, there sometimes just isn't a way to fix the damage.