…might be taken as an index of the health of the Filter Functions of the ACC.  If the ‘I’ mediates between competing social influences, and biological needs, then a healthy self might be signalled by an ease in the use of the term ‘I’.  Switching allegiance between teams and the personal.  That seems plausible.  And then you realize that Johnny switched to the third person.  And that’s a common manifestation.  Again, we can reason our way into these psychotic patterns.