An interesting question here is the direct connection between neurology and psychology which is very weakly understood and while we all feel comfortable assumin

An interesting question here is the direct connection between neurology and psychology which is very weakly understood and while we all feel comfortable assuming more than just a correlation but an actual causal relationship between the two, we don't know this to anything like the degree we do with the laws of Physics. At to defining science, there is a long history of defining what is and isn't science. This isn't arbitrary. When something is dismissed as not science it's not just bias, it's because people see it as failing to meet certain criteria. That's too long to go into here, but a good starting point in your reading there would be Karl Popper. His description of scientific theories requiring the property of falsifiability, revolutionary as it was at the time, is fairly well accepted at the heart of what is thought of as science today.