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The principle of sufficient reason asserts that anything that happens does sofor a reason: no definite state of affairs can come into being unless there isa sufficient reason why that particular thing should happen. This principle isusually attributed to Leibniz, although the first recorded Western philosopherto use it was Anaximander of Miletus. The demand that nature be rational, inthe sense that it be compatible with the principle of sufficient reason,conflicts with a basic feature of contemporary orthodox physical theory, namelythe notion that nature's response to the probing action of an observer isdetermined by pure chance, and hence on the basis of absolutely no reason atall. This appeal to pure chance can be deemed to have no rational fundamentalplace in reason-based Western science. It is argued here, on the basis of theother basic principles of quantum physics, that in a world that conforms to theprinciple of sufficient reason, the usual quantum statistical rules willnaturally emerge at the pragmatic level, in cases where the reason behindNature's choice of response is unknown, but that the usual statistics canbecome biased in an empirically manifest and apparently retrocausal way whenthe reason for the choice is empirically identifiable. It is shown here that ifthe statistical laws of quantum mechanics were to be biased in a certainplausible way then the basically forward-in-time unfolding of empirical realitydescribed by orthodox quantum mechanics would generate the appearance ofbackward-time-causation of the kind that have been reported in the scientificliterature.

Apparent Retrocausation as a Consequence of Orthodox Quantum Mechanics Refined to Accommodate the Principle of Sufficient Reason