I just finished reading the Grid Cells paper. (Great stuff, thanks). Maybe this has been asked before elsewhere, but…
If the neocortex consists of modular columns (the big ones, not the mini-columns), and they are presumably functionally interchangeable, how would grid cells then be used in those regions that à priori don’t require them, like for language, music, abstract thought, etc. Would the location layer be suppressed there? Or could there be a use for location input on a more abstract level? Like for instance moving up and down in a tune for pitch or for volume.
It seems strange, but having all this hardware in every column, and then not have a use for it, seems even stranger. If it is missing or less important in some area’s, perhaps the layer would be less developed, and the neurons there less dense.
Furthermore I think the Numenta website should have a merchandise section offering the Numenta cup.