Place Cells & Grid Cells
Hippocampal place fields + entorhinal grid cells: path integration, spatial firing maps
Place Cells
N place cells
6
Field width σ
0.18
Peak rate
15
Each place cell fires when animal is in its "place field" (Gaussian tuning). Ensemble = population vector code for location.
Grid Cells
Grid spacing λ
0.30
Grid angle θ
0
Peak rate
20
Grid cells fire at hexagonally arranged spatial locations. Spacing and orientation define grid module. Path integration mechanism.
Navigation
Speed
0.015
Persistence
0.96
Simulated foraging trajectory (persistent random walk). Left: path in arena. Middle: place field map. Right: grid cell map.