p590fig16.21 Frequency of membrane potential oscillations in grid cells decreases along the dorsoventral gradient of the MEC.<BR>||  Dorsoventral gradient in the frequency of membrane potential oscillations of MEC layer II stellate cells (Giocomo etal 2007).  (C left column) Oscillation (Hz) vs distance from dorsal surface (mm).  (D right upper) [dorsal, ventral oscillations 5mV-500ms.  (E right lower) [dorsal, ventral oscillations 100ms.  Both membrane potential oscillation frequency and resonance frequency decrease from the dorsal to ventral end of MEC.