We don't have a complete physical picture of what each individual macro feature (e.g. nerve ending, molecule of dopamine) of the brain is doing at any given ins

We don't have a complete physical picture of what each individual macro feature (e.g. nerve ending, molecule of dopamine) of the brain is doing at any given instant. We are starting to understand neuronal topology. It's really like a program binary for which you don't have a disassembler, but maybe you have limited symbol information that you can look at in a debugger.