I've read some things in the past about negations that simply didn't fit with common sense probably because the authors in question seemed to be trying to make one rule fit all.
The subconscious can and does parcel out negations depending on the amount of conscious focus given as one reads or hears the sentence or question.
I think that in most contexts we get a gut-feeling about the meaning and intent of the sentence. Let me give you some examples of negations where the subconscious (yours) will parce out the negation and a couple where it parces out nothing at all (even though there's a nice big negation in there;0).
"I can't do anything right." (Obviously, this negation is NOT parced. You know the sentence is being self-negative.)
"I don't want to watch that program?" Ask yourself, does this person want to watch the program after saying this? I say no! Another case where the negation was NOT parced!
However, if I said,"Don't you just love that program?",the message is a suggestion to love that program, right? The negation "Don't" was parced right out and the real message coming through is 'you love that program?'
One more:"Aren't I the nicest guy in the world?" Again, even with the negation, the implicit message is that I am the nicest guy in the world (and I am too btw;0)).
In all cases, the meaning and intent came through pretty clear even though there were negations in all four of them!
Hope this was helpful!---Mike