i would think intjs should exceed above all the other mbti types in rational abilities. as for the internal dialoguing such as second guessing, paranoia, strong anxiety, and instincts, other intjs have circumnavigated this trend through various methods. personally i am center brained and can consciously control which side of the brain to use more dominantly for questions. i.e. right brain: access to visual (spatial)/auditory construction, feelings; left brain: access to visual/auditory remembrance. i have found that the above forms of internal dialoguing arise from blurred thoughts from the left and right. its all about organizing ones own thinking hierarchy. after all, isn't the hallmark of the intj self reflection/absorption and deep lines of thought? furthermore, in general intjs might benefit from learning to tie off their bag of emotions and mushy thoughts.