p586fig16.15 Superimposing stripe cells oriented by 45 degrees does not lead to learning of rectangular grids in GRIDSmap, but it does in an oscillatory inference model.<BR>||  Why is a hexagonal grid favored?  Superimposing firing of stripe cells oriented at intervals of 45 degrees.  Rectangular grid. This and many other possibilities do not happen in vivo.  They do happen in the oscillatory inference model.  How are they prevented in GRIDSmap?