The problem is you cannot figure out just how brain works, because it is not kind of system where you can detach something and make it work in separation. For s

The problem is you cannot figure out just how brain works, because it is not kind of system where you can detach something and make it work in separation. For some limited understanding you can get as far as 'limphatic system' does that, 'digestive system' does other stuff. But in simulating it you have to take into account all chemical and physical interactions.