It's an interesting study. It explains where we are in culture, and it explains the disconnect between beliefs. Historically I think, there have been three major categories of philosophy in the west. Material and mind (think, Theism), material-only (Universe-as-machine, nothing more than cause/effect), and mind-only (incorporation of Eastern philosophies, the mind creates reality).
Western rational thought was founded on the first--that there is an ultimate reality to be known, and we have been created with the capacity to know it,
Postmodernism is actually one expression of the mind-only school of philosophy. There is no ultimate truth. It's just up to each of us to create our own truth, and no one's truth is any better than anyone else's. It's actually hateful to try to impose your truth on someone else.
If you think about it, that philosophy is self-refuting on many levels. But when someone has been conditioned to ignore truth, they're conditioned to ignore internal contradictions in thinking. And when they've been condition to confuse emotion with thought, you get emotion as thought.