Table 2.

Neuron model variables

ParameterDescriptionValue
CmMembrane capacitance0.5 μF
gmMembrane conductance25 nS
VlLeak reversal potential−70 mV
VtFiring threshold−50 mV
VresetReset potential−65 mV
τAMPAAMPA time constant5.26 ms
τNMDA,fFast NMDA time constant1.485 ms
τNMDA,sSlow NMDA time constant152 ms
τGABA,fFast GABA time constant2.83 ms
τGABA,sSlow GABA time constant50 ms
EAMPAAMPA reversal potential0 mV
ENMDANMDA reversal potential0 mV
EGABAGABA reversal potential−80 mV
gAMPAAMPA conductance21.5 nS
gNMDANMDA conductance0.47 nS
gGABAGABA conductance14 nS
[Mg2+]Extracellular Magnesium concentration1 mM
I̅e̅x̅c̅Mean uniform constant excitatory input to grid cells in the absence of recurrent inhibition0.825 μA
I̅e̅x̅c̅Mean uniform constant excitatory input to grid cells in the presence of recurrent inhibition0.85 μA
I̅e̅x̅c̅Mean peak spatially modulated excitatory input to grid cells0.88 μA
I̅l̅h̅h̅Mean uniform constant excitatory input to interneurons0.125 μA
σexcSD of excitatory input to grid cells0.125 μA
σinhSD of excitatory input to interneurons0.25 μA
σPFSD of spatially modulated excitatory input30 cm