An interesting thought experiment is to imagine an incredibly-detailed computer simulation of a brain, down to the level of individual cells and neurotransmitters. (While this is beyond our current capabilities, it is in principle possible.) Hook the brain up to some decent IO devices, and you’d have an extremely human-like “AI”. (I’m glossing over some tricky details like, do you start with a fetus/baby brain and le…
It probably helps to think about some edge cases to get some insight.
What happens when you sleep and you loose sense of conciousness?
What happens in cases of brain injury where concousiness goes into weird failure modes - thinking it wakes up on the same state every day, thinking it's -1month or so, collapsing etc.
What happens in cases of distorted/malfunctioning brain schizophrenia etc.
I've read somewhere that if you put implant which mimics neuron activity, your brain will build structure around it just like with normal neurons. What would happen if you take 1 square mm of brain and replace it with implant, slowly replacing the whole brain? What happens when you attach brain to larger structure/orders of magnitude more complex one, will conciousness transfer there? Can you disconnect original brain leaving conciousness?
As we don't have powerfull computers yet to compete with brain, is it possible to connect two brains instead?
Memory is likely playing central role. You are what you remember it seems. Can you boost memory capacity with some implants, will it make more-conciousness?
There are many not yet feasible experiments, but some should be. Also completely brutal in many cases.