TABLE 1.

Model parameters used to simulate the contextual conditioning protocols (Shouval et al., 2002)

Parameter	Description	Value
τ	Time constant of the neuronal membrane	20 ms
vrest	Neuronal resting potential	−65 mV
v*	Neuronal firing threshold	−55 mV
vreset	Neuronal reset potential	−75 mV
λ	Synaptic strength decay constant	0.1
${\tau }_1^{\mathit{ep}}$	Slow EPSP time constant	50 ms
${\tau }_2^{\mathit{ep}}$	Fast EPSP time constant	5 ms
α1	Parameter used in the definition of Ω (Equation ((5))	0.35
α2	Parameter used in the definition of Ω (Equation ((5))	0.55
β1	Parameter used in the definition of Ω (Equation ((5))	80
β2	Parameter used in the definition of Ω (Equation ((5))	80
P1	Parameter used in the definition of η (Equation (7))	0.1 s
P2	Parameter used in the definition of η (Equation (7))	P1 /10−4
P3	Parameter used in the definition of η (Equation (7))	3
P4	Parameter used in the definition of η (Equation (7))	1 s
τCa	Calcium time constant	50 ms
P0	Probability of NMDAr opening after action potential	0.5
GNMDA	NMDAr conductance	−1/500 [μM/(ms · mV)]
If	Fast NMDAr current component intensity	0.5
Is	Slow NMDAr current component intensity	0.5
τf	Fast NMDAr current component time constant	50 ms
τs	Slow NMDAr current component time constant (NMDAr)	200 ms
Vr	Reversal potential for calcium	130 mV
Aθ	Amplitude of the intracellular theta oscillation	3 mV
$I_f^{\mathit{bs}}$	Fast BPAP component intensity	0.75
$I_s^{\mathit{bs}}$	Slow BPAP component intensity	0.25
${\tau }_f^{\mathit{bs}}$	Fast BPAP component time constant	3 ms
${\tau }_s^{\mathit{bs}}$	Slow BPAP component time constant	25 ms
K	Number of simulated input spikes	900
rsafe	Fear cells' firing rate in the safe compartment	0.85 Hz
rthreat	Fear cells' firing rate in the threatening compartment	1.85 Hz