It's a bit similar to the problem of neuroscience. We understand how a single neuron works pretty well, or even a small count of them. Even a few subsystems lik

It's a bit similar to the problem of neuroscience. We understand how a single neuron works pretty well, or even a small count of them. Even a few subsystems like balance or lower level vision. A bit on muscle control and endocrine system. We do not understand language, grammar, music, only partly emotions, or especially sentience and consciousness. Further, we don't understand how the disparate systems are integrated together.