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Volume 52 • Number 4

October 2015



Contagious Blindspots: Formal Ignorance Spreads to Peers

by Roy Sorensen


A blindspot is a consistent but inaccessible proposition. For instance, I cannot know 'The test is on Friday but I do not know it'. No contradiction follows from the supposition that you know my blindspot. But could you know my blindspot if we are epistemic peers? Epistemic peers have the same evidence and reasoning ability. So either both peers know a proposition or both are ignorant. Since I cannot know my blindspot, neither can my peer. Thus the formal ignorance associated with blindspots spreads to my peers. This contagion is used to improve a solution to the blindspot solution to the surprise test paradox.

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ISSN: 2152-1123