This chapter begins with a discussion of the traditional paradigm of one-way necessitation — the relation of determinate to determinable. It then considers the question: What if mental phenomena are determinables of physical phenomena in something like the traditional sense? Then since a determinate cannot preempt its own determinable, mental events and properties lose nothing in causal relevance to their physical bases. If anything, it is the other way around. Overladen as they frequently are with physical details far beyond the effect's causal requirements, it is the physical phenomena which are liable to disqualification on grounds of superfluity.
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