thegrey_one parent
I don't think it's anything other than electric activity, but it's clearly not "some electrical signal". It's the totality of them. They are many, and complicated. And they seem to be required for consciousness. Doubt there's any proven conscious state in a human, lacking electrical activity in the brain.
Re just electrical activity, I think you can add empirical evidence it's chemical as well as beer and other substances can affect your perception of reality.
There was an AMA about conjoined twins on Reddit a couple of years ago, and one of the interesting parts was that they could each sense how the other twin is feeling in terms of emotions. This is due to a lot of emotional states being based on hormones that flow through their shared blood stream.
https://www.reddit.com/r/AMA/comments/1cgetlq/were_conjoined...