Structural PSR and the Hard Problem: A Biconditional, with Consequences for Cosmopsychism

This paper completes a biconditional established in two prior works. [1] shows, conditionally on structural PSR, that the universe must have a coextensive phenomenal mind — that any structural-PSR-consistent universe is conscious at cosmic scale. The present paper establishes the converse direction: if there is a non-brute answer to the hard problem of consciousness, then structural PSR is true — a conclusion that is conditional throughout on that antecedent. The argument proceeds by reductio ad absurdum. Assume structural PSR is false and that a non-brute answer to the hard problem exists. [2] establishes that without structural PSR, every explanatory chain terminates in brute fact — not merely at the cosmic level but at every level, because the universe’s unexplained structural existence undermines the foundations of explanation generally. A non-brute answer to the hard problem must cite features of the universe’s complete structure as its explanatory ground: no viable non-brute account escapes this structural dependence. Every candidate non-brute account — psychophysical laws, proto-phenomenal properties, Russellian intrinsic natures, cosmopsychist primitives — invokes structural features of the universe, and those features are exactly what structural PSR demands be explained. Without structural PSR those invoked features are brute, and any answer grounded in them inherits that bruteness. The conjunction of the two assumptions therefore generates a contradiction: the hard-problem answer is simultaneously non-brute by assumption and brute by the propagation of unexplained structural existence. One assumption must be released. Since the argument conditionalizes on the existence of a non-brute answer, structural PSR follows conditionally on that assumption. Together with the derivation in [1], this yields the full biconditional: structural PSR is true if and only if there is a non-brute answer to the hard problem. The two problems — why does the universe exist as it does, and why does it have a phenomenal interior — are not merely related. They are the same problem.