Somehow I didn't realize that you really meant what you wrote in the OP. I purposely misread to mean what I responded to, yet you actually meant that you can't distinguish... Um... that's a thinker. CAn I get back to you on that?
Depends on the circumstances. Currently, no, but sometimes it has. Usually for seemingly unrelated reasons.
And by seemingly unrelated, I mean stuff like, my leg is bleeding, or I have a headache.