I suspect that, especially in dreams, and to a lesser degree in déjà vu, the output of place cells have the ability to be combined in novel ways that normally might be rejected when fully conscious. I am not aware that anything similar has been discovered regarding familiar people, but if so, that would work in a surprisingly similar way ("Don't I know you from somewhere?"), and would accommodate the typical example. What the unconscious mind composes as a shorthand template for my mother is later detailed, but still contains the "my mother" flag; although my fourth grade teacher has many similar qualities, she has the "my fourth grade teacher" flag. Maybe the reasoning that the RDPC enables is the choosing between simultaneous data streams, and diminished or overactive capabilities of the RDPC can cause delusions accordingly.