As brains get bigger, you get more compute, but you have to solve the "commute" problem. Messages have to be passed from one corner to the other, and fast. And there are so many input signals coming in (for us, likely from thirty trillion cells, or at least a significant fraction of those). Not all are worth transporting to other corners. Imagine a little tickle on your toe. Should that be passed on? Usually no, unless you are in an area with creepy crawlies, and other such situation. So decisions have to made. But who will make these decisions for us? (Fascinating inevitably recursive question we'll come back to)

This commute is pretty much ignored when making artificial brains which can guzzle energy, but matters criticallyfor biological brains. It needs to be (metabolically) cheap, and fast. What we perceive as a consciousness is very likely a consensus mechanism that helps a 100 billion neurons collectively decide, at a very biologically cheap price, what data is worth transporting to all corners for it to become meaningful information. And it has to be recursive, because these very same 100 billion neurons are collectively making up meaning along the way. This face matters to me, that does not, and so on. Replace face with anything and everything we encounter. So to solve the commute problem resulting from a vast amount of compute, we have a consensus mechanism that gives rise to a collective. That is the I, and the consensus mechanism is consciousness

We explore this (but not in these words) in our book Journey of the Mind.

You'll find that no other consciousness model talks about the "commute" problem because these are simply not biologically constrained models. They just assume that some information processing, message passing will be done in some black box. Trying to get all this done with the same type of compute (cortical columns, for instance) is a devilishly hard challenge (please see the last link for more about this). You sweep that under the rug, consciousness becomes this miraculous and seemingly unnecessary thing that somehow sits on top of information processing. So you then have theorists worry about philosophical zombies and whatnot. Because the hard engineering problem of commute was entirely ignored.

https://www.goodreads.com/en/book/show/60500189-journey-of-t...

https://saigaddam.medium.com/consciousness-is-a-consensus-me...

https://saigaddam.medium.com/conscious-is-simple-and-ai-can-...

https://saigaddam.medium.com/the-greatest-neuroscientist-you...