In that case then yes, I'd have to go with my first instinct. It confuses the bejeezes out of me why instincts feel as strong as they do, but I guess if you had no other learned information or experience to go on and the choice was to do one thing or the other, then yep, you'd cut the wire that you felt was right at the time.
I guess that could be attributed to part of natural selection (? I don't know, just guessing here) but if a human didn't know of or see another human eat a berry on a tree, who then didn't survive, they would go with their gut instinct and eat the berry. If they had no other info to go on, they would go with their gut feeling not knowing if the berry was poisonous or not.