A radical, dogmatic philosophical stance, common in online
science communication circles, asserting that everything
real is ultimately reducible to the entities, properties, and laws of fundamental physics. Unlike moderate physicalism, this variant is militant and contemptuous: it treats explanations from biology, psychology, sociology, or the humanities as “illusion,” “epiphenomenon,” “empty discourse,” or “pseudo‑matter.” Adherents believe physics already contains (or will
soon contain) all
truth; other disciplines are mere “engineering” or “second‑class
science.” They often ridicule consciousness, free will, meaning, and intentionality as “ghosts in the machine” or “evolutionary cognitive errors.” In practice, a hard‑narrow physicalist denies ontological
reality to anything not measurable by a particle detector or describable by a differential equation—including moral values, subjectivity,
history, and even mathematics (reduced to computational physics). The position is self‑contradictory: no physical experiment can prove hard‑narrow physicalism; it is itself a metaphysical belief. Its proponents habitually block critics.
Hard-Narrow Physicalism Example: “A hard‑narrow physicalist argued that ‘pain is just a firing pattern of C‑fibre neurons,
nothing more.’ When asked about the subjective experience of pain, he replied: ‘That’s an
illusion of
language. You’re falling into Cartesian error. Only physics matters.’ Then he blocked everyone.”