p585fig16.14 Superimposing firing of stripe cells whose directional preferences differ by 60 degrees supports learning hexagonal grid cell receptive fields in GRIDSmap.<BR>||  GRIDSmap: from stripe cells to grid cells.  Grid-cell Regularity from Integrated Distance through Self-organizing map.  Superimposing firing of stripe cells oriented at intervals of 60 degrees.  Hexagonal grid!