Anti-realism
In art, realism is the opposite of naturalism. Naturalism is to reproduce only a tiny slice of reality, if it is even that, namely the part of reality dealing with material things. This is a form of reductionism, which is a form of nihilism.
Twin Peaks is the most realistic work of art I know of, because it depicts with remarkable precision, what it is like to be alive in reality.
“Naturalistic art” is an oxymoron: “art” is the antonym of “nature.”
“Behavioralist psychology” is also a contradiction. A psychologist is someone who studies the soul. Yet a behavioralist is someone who observes humans as though they were machines, purely from the outside. It is thus form of nihilism: a behavioralist psychologist is a psychologist who denies the existence of the psyche. They are traitors to their field and to reality itself.
Or, like philosophers of mind that claim to disbelieve in the existence of consciousness (I mean the ones that say stuff about “folk psychology” and so on). Generally, so-called “analytic philosophy.”
(By the way, it is not a coincidence that behavioralism is so strong in the Usanian academia, nor that analytic philosophy is also very strong there.)