Kripkean a posteriori necessities suggest that identity statements like 'pain = C-fiber firing' are, if true, necessarily true—ruling out consciousness without its actual physical realizer.

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C-fiber firing(an example of a physical phenomenon being compared): The electrical activation of nerve fibers in your nervous system, often used as an example of a physical, brain-based process.
Kripkean(as used in metaphysics and philosophy of language): Relating to the ideas of philosopher Saul Kripke, who argued that the identity of things (like what makes gold gold) depends on their deep physical properties, not just how they appear to us.
Necessities(as used in ethics and economics): Things people absolutely need to survive or function in society, like food, shelter, healthcare, or employment.
Physical realizer(in philosophy of mind): The actual physical stuff or mechanism that makes something work—like how neurons are the physical realizers of thoughts, or how electrical circuits are the physical realizers of computer programs.

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