Quote Originally Posted by SisOfNight View Post
The similarity lies in the fact both deal with internalized perceptions of the world; either the sensorial world, or the abstract world.
However, Si and Ni are still very different in other aspects. Saying Si and Ni are very similar is like saying Fi and Ti are very similar, aka Feeling and Thinking or Sensing and Intuition...
I don't think it is that easy. But for understanding Si and Ni, your simplified comparison may be sort of helpful to some.
Fi and Ti hmmm...I quite recall some people being stuck on choosing between just two functions. Because to ask oneself "Why do I really want to be different / in which way am I unique?" and answer "emotionally or logically" is not as simple as it might sound. Indeed it is not .