Table 1.

Network variables

ParameterDescriptionValue
Noffset, 1D trackTotal number of distinct grid patterns on the 1D track40
Noffset, 2D arenaTotal number of distinct grid patterns in the 2D arena36
NVCO, offset, 1D trackTotal number of VCO cells in each ring attractor circuit on the 1D track40
NVCO, offset, 2D arenaTotal number of VCO cells in each ring attractor circuit in the 2D arena6
NcopyTotal number of grid cells that receive input from a common set of VCOs48
NINH,copyTotal number of interneurons that receive input from a common set of grid cells12
NVCO,copyTotal number of VCO ring attractor circuits for each preferred direction30
VCOVCO preferred directionsπ/3, 2π/3, π 4π/3, 5π/3, 2π rad
σSD of VCO preferred direction noiseFormula rad
r̅V̅C̅O̅Mean VCO firing rate50 Hz
fLFPBaseline oscillation frequency8 Hz
βVCO velocity/oscillation frequency gradient0.209 cm−1
Simulation time step1 ms
σVCOSD of VCO phase noise0/0.015 rad
αVCOVCO phase reset increment0.5
wGC,VCOSynaptic weight of VCO to grid cell connections0.0045
kGC,INHMean synaptic weight of interneuron to grid cell connections0.04 cos (Δφ)
kINH,GCMean synaptic weight of grid cell to interneuron connections0.2
σGC,INHSD of interneuron to grid cell connection strengths0.1
σINH,GCSD of grid cell to interneuron connection strengths0.2
pGC,INHInterneuron to grid cell connection probability0.7
pINH,GCGrid cell to interneuron connection probability0.5
tresetTime for which VCO phase reset proceeds before movement onset5 s