In terms of brain scans I am not sure what their worth would be in determining morality. All they can tell is what parts of the brain are receiving more blood flow and therefore are more active. While each part of the brain performs a different function, this can still only tell us what is normal for our species.
You need a principle such as to minimise suffering before you can use science to determine how to most effectively go about that. And then if you did that I am sure you'd end up with some unintended consequences such as destroying all life on Earth.
Science is a tool that we can use to gather information and tell us how to achieve things. I am not sure it should be making our decisions for us. Once you get into doing that, you're running into the same problems that we fear can come from Artificial Intelligence.
You need a principle such as to minimise suffering before you can use science to determine how to most effectively go about that. And then if you did that I am sure you'd end up with some unintended consequences such as destroying all life on Earth.
Science is a tool that we can use to gather information and tell us how to achieve things. I am not sure it should be making our decisions for us. Once you get into doing that, you're running into the same problems that we fear can come from Artificial Intelligence.