The IP elements: Questions concerning differences in internal focus between Si and Ni

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I find descriptions of weak Si types difficult to understand. How anyone can have such trouble feeling sensations is beyond me.

I think, for me, there is a sort of filtering of sensation. Some sensations i am completely oblivious to, and others have a profound effect on my physical and psychological state. I will never notice what people are wearing, what i myself am wearing, if my shoes fit right etc. But i can never stand to be thirsty, not even a little.