p600fig16.36 The entorhinal-hipppocampal system has properties of an ART spatial category learning system, with hippocampal place cells as the spatial categories.  See the text for details.<BR>||  Entorhinal-hippocampal interactions as an ART system.  Hippocampal place cells as spatial categories.  Angular head velocity-> head direction cells-> stripe cells- small scale 1D periodic code (ECIII) SOM-> grid cells- small scale 2D periodic code (ECII) SOM-> place cells- larger scale spatial map (DG/CA3)-> place cells (CA1)-> conjunctive-coding cells (EC V/VI)-> top-down feedback back to stripe cells- small scale 1D periodic code (ECIII).   stripe cells- small scale 1D periodic code (ECIII)-> place cells (CA1).