Full Idea
We might make the basic contextualist schema more precise ...by saying the change in content will consist in a change in the range of relevant alternatives. Higher standards would discriminate from a broader range of alternatives.
Gist of Idea
We can make contextualism more precise, by specifying the discrimination needed each time
Source
Keith DeRose (The Case for Contextualism [2009], 1.14)
Book Reference
DeRose,Keith: 'The Case for Contextualism' [OUP 2009], p.34
A Reaction
This would handle the 'fake barn' and 'disguised zebra' examples, by saying lower standards do not expect such discriminations. The zebra case has a lower standard than the barn case (because fake barns are the norm here).