Instinct is not always impulsive. With experience, what we call instinct is actually part of our mind that knows something so well that we don't even need to consciously think about something--e.g. the instincts that ER surgeons or soldiers have are not blind impulses, but the workings of a trained mind. Likewise I listen to instincts as a mother. When I "just know" something is wrong I'm usually not being silly--my mind had subconsciously observed things and noticed something did not line up with expected patterns. I don't follow every impulse, but when I have a nagging feeling, I always stop to consider that my brain might be trying to tell me something.