The knowledge argument is either unsound or redundant

Abstract

Jackson’s formulation of the knowledge argument has had an inestimable influence on the discussion of consciousness and the apparent problem it presents for physicalism. A common objection to KA is the ‘ignorance objection’. According to this objection, our intuitions about Mary merely reflect our ignorance of physical facts that are integral to the explanation of phenomenal consciousness. Armed with the insights of a future science, Mary would actually be able to deduce what it’s like to see red. We only have the intuition that Mary would learn something new because we don’t know what she knows. Those sympathetic to KA have brushed away the ignorance objection on the grounds that evstructuren though we don’t know what the future science of consciousness will reveal, we do know what kind of facts it will contain and know that these are the wrong kind of facts from which to deduce facts about phenomenal consciousness. In other words, they suggest that the insight that underwrites KA is ‘future-proof’: it is not the kind of insight that could be displaced by new scientific knowledge. I argue that this strategy for defending KA is dialectically problematic and reveals a fundamental limitation of the Mary thought experiment.

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Tom McClelland
Cambridge University

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