I have what I am sure is a crazy idea how the transform from sensor-egocentric space to allocentric transforms works but I will share it here for public amusement:
The senses are put into relative space by “decorating” the posture control system.
Say what?
We all possess an elaborate body sensing system that is hardwired to combine every joint and muscle from the ground all the way to the vestibular sensing / ocular pointing system. This has been trained and tuned every day of your life as a coordinate transformation system and is your basic reference frame. This reference frame extends to all the places you have learned to put your hands and feet - your personal space. This paper points out the relationship between egocentric sensation and spatial processing. My one quibble with this paper is that the proprioception defects happened well after the subjects had formed a language and allocentric relationships.
So how do we get from “here” to relate that to “out there?”
The rest of the world is on “the other end” of the vestibular system. Learning the relationship between your internal reference system and all its permutations and the perceived “out there” is the dimensional mapping that forms your transform to the allocentric universe.
The interaction of your hands and perceived space is formed by the learned relationship between the aforementioned personal reference frame and your visual learned perception of your near working field. There is a reason that damage to the upper end of the WHERE stream impairs your manual manipulation skills; this is where your vision processing and somatosensory streams join.
Well - tell me the 100 ways I am wrong about all this.