SIATD would be a better person to discuss Derrida and the like than I, for I agree that such a position is absurd (though I do believe it is somewhat meant to be) and furthermore, I’m gonna go with Ucci on this one and say that it goes against common experience in such an extreme manner as to be unusable as a philosophical statement.
But . . . that is from my perspective. My girlfriend, for example, feels that what Derrida says about this is intuatively true and often feels an inability to vocalize her thoughts. I, personally, fail to see how such a thing could occur. The only time I have had difficulty expressing my thoughts is when I felt the evidence was so overwhelmingly in my favour that all I need do was present the evidence and say, “So, I’d like to investigate this” when my boss wanted a more formal proposal. And even in that case, it had much more to do with my extremely limited experience in the area – I couldn’t write a formal proposal without a lot more digging, which I believe, was the point. So, I tend to think that being unable to express one’s thoughts stems from ignorance rather than their construction.
As someone whose knowledge of Umwelt is still very small, would you mind clarifying how Evolutionary theory goes against it? Merely because the authors didn’t buy it doesn’t mean that it can’t be seamlessly integrated into the philosophy, or?