To an objectivist (an adherent to an epistemology confined to objective comprehension), all truth is objective knowledge of objective reality.
Objective knowledge — as opposed to what? Subjective experiences.
If a subjective experience motivates behavior, it triggers an event in objective reality, and now can be known objectively as truth. Until then, subjectivity is objectively real only as neural processes productive of mental epiphenomena.
Objectivism sees objects of sight, while excludes its own seeing as real.
Objectivism is often materialist, but not essentially.
Objectivism concerns form; materialism concerns substance.
Matter is unformed but formable; understood formationally matter it is material.
A metaphysics of matter differs from a material metaphysics.
Someday, when materialists figure out how to explain the emergence of consciousness from non-conscious matter, without committing the performative contradiction of assuming and relying upon both their own consciousness and the consciousness of those to whom they explain away consciousness, I’ll take them seriously as philosophers.
Until then, I’ll regard them as scientistic technicians unconsciously overstepping the bounds their mastery into metaphysical questions they do not yet even know how to ask, much less answer.
The methodological reductionism so virtuous and necessary to science is, when applied to metaphysics is not only unhelpful but vicious. To confuse the ontology and practice of science with the ontology and practice of metaphysics is to conflate objective braininess with wisdom (the intuition of reality beyond the cognitive grasp of objectivity).
We can, and maybe should, place panpsychism outside of the domain of science, but we should never allow the domain of science to limit or even dominate or even try to found/underpin/regulate the super-domain of understanding to which science belongs as part.
The same error that places knowledge under the rule of science, and locates subjectivity within objective reality also sees design as a subset of engineering. Design is the superset, and all engineering work should be defined, guided and supervised by design.