Full Idea
The problem for invariantism is that competent speakers, under sceptical pressure, tend to deny that we know even the most conspicuous facts of perception, the clearest memories etc.
Gist of Idea
There aren't invariant high standards for knowledge, because even those can be raised
Source
Stewart Cohen (Contextualism Defended [2005], p.58)
Book Reference
'Contemporary Debates in Epistemology', ed/tr. Steup,M/Sosa,E [Blackwell 2005], p.58
A Reaction
This is aimed at Idea 12892. This seems to me a strong response to the rather weak invariantist case (that there is 'really and truly' only one invariant standard for knowledge). Full strength scepticism about everything demolishes all knowledge.
Related Idea
Idea 12892 Maybe there is only one context (the 'really and truly' one) for serious discussions of knowledge [Conee]