p591fig16.23 The Spectral Spacing Model uses a rate gradient to learn a spatial gradient of grid cell receptive field sizes along the dorsoventral gradient of the MEC.<BR>||  Spectral spacing model.  Map cells responding to stripe cell inputs of multiple scales.  Grid cells: MEC layer II (small scale 2D spatial code).  Stripe cells: PaS / MEC deep layer (small scale 1D spatial code).  Path Integration.  Vestibular signals- linear velocity and angular head velocity.  SOM.  How do entorhinal cells solve the scale selection problem?