James Fallon is a neuroscientist who a few years ago, late in life, figured out from his science he was a sociopath.
Daniel Kahneman, in Thinking Fast and Slow, makes a distinction between System One thinking (what your basic instincts tell you) and System Two thinking (realizations and ideas gleaned for reflection and dispassionate analysis). Imagine having your science telling you something like this. NPR covered it here.
More recently, he told his story for The Moth Radio Hour. That account can be found here, in segment two.
An Irish Roman Catholic, Fallon has more than a touch of Mort Sahl in his delivery. Worth a listen.