Since several of the comments here revolve around what we know now and could possibly know now about brain differences related to behavior, I'll link to a book, Brainwashed: The Seductive Appeal of Mindless Neuroscience,[1] that examines for a popular audience how much science is behind the latest "neuroscience" and how much of it is just hype. Just because brain scans are involved doesn't mean the explanation is any more valid. I think you will find this book interesting and helpful for understanding yourself and understanding the world.
I heard about the NIMH director's letter on research priorities[2] first from behavior-genetics-informed research and clinical psychologists whom I meet in a "journal club" weekly during the school year. The DSM framework involves a lot of log-rolling among various kinds of psychologists and psychiatrists, several of whom depend for their living on being known as "experts" on "disorders" that may not have any real existence. That said, there is an active research program all over the world based on a variety of different paradigms, with very widely followed journals, trying better to understand healthy human behavior and debilitating human behavior that results from brain abnormalities, diseases, psychological stress, and other causes. Straight-up psychology still has a lot to contribute to this study. The psychologists I know best are very aware of critiques of their own discipline[3] through the readings we discuss in the journal club, and more generally aware of the general critique of the current conduct of science,[4] so they redouble their efforts to do their science better, and to check their methodology as they try to tease out the complex web of causes of human behavior.
A Skeptics Guide to the Mind by Robert Burton touches on the same subject; the gulf between modern neuroscience and what we actually understand about the mind. Burton points that we still are in many circumstances unable to differentiate between conscious from unconscious thought. A brain scan can only tell us about the brain but not necessarily about the mind.
I heard about the NIMH director's letter on research priorities[2] first from behavior-genetics-informed research and clinical psychologists whom I meet in a "journal club" weekly during the school year. The DSM framework involves a lot of log-rolling among various kinds of psychologists and psychiatrists, several of whom depend for their living on being known as "experts" on "disorders" that may not have any real existence. That said, there is an active research program all over the world based on a variety of different paradigms, with very widely followed journals, trying better to understand healthy human behavior and debilitating human behavior that results from brain abnormalities, diseases, psychological stress, and other causes. Straight-up psychology still has a lot to contribute to this study. The psychologists I know best are very aware of critiques of their own discipline[3] through the readings we discuss in the journal club, and more generally aware of the general critique of the current conduct of science,[4] so they redouble their efforts to do their science better, and to check their methodology as they try to tease out the complex web of causes of human behavior.
[1] http://www.amazon.com/Brainwashed-Seductive-Appeal-Mindless-...
[2] http://www.nimh.nih.gov/about/director/2013/transforming-dia...
[3] http://opim.wharton.upenn.edu/~uws/
[4] https://med.stanford.edu/profiles/john-ioannidis?tab=publica...