I'll be the first to admit that I'm a bit confused by what you mean with "phyisology." If you meant physiology, then I would still be confused as I thought this had more to do with biology. I'm going to go out on a limb here and assume that you meant politics and psychology, so forgive me if I am wrong and hopefully someone else would be able to render better assistance. Regardless of what you meant, I think that The Righteous Mind: Why Good People Are Divided by Politics and Religion by Jonathan Haidt is an important book to read. The author actually spent close to thirty years researching moral psychology and his findings are absolutely fascinating. Contrary to what many people may think, he discovered that it is gut feelings and not reason that tend to determine how people make their moral judgments. It doesn't matter if you are a conservative, liberal, or libertarian, this book can help you to understand the other side a bit better. What I like most about it, is that it is not as preachy as other political books and actually offers some genuinely good insights.

Another great book is one by Jessamyn Conrad called What You Should Know About Politics, But Don't: A Nonpartisan Guide To The Issues That Matter. It's one hell of a long title, but delve into it and you will find a well written and well presented look at a very complicated subject. Once again, it doesn't matter what your political stance is, whether you are a Democrat or a Republican, or even somewhere in the middle like most Americans. The book has a wealth of topics and you can either work your way through everything or just brush up on the ones that you are unfamiliar with. I know it helped me a lot to understand why so many people are at each others throats over climate change and immigration. The book is obviously based on American politics, but it really cuts through the clutter. Hope you enjoy my recommendations and that I managed to help you correctly with your question!