Table 1.

Parameters and constants

Name	Value	Units	Description
q	1.60217733 × 10−19	C	Elementary charge
K	1.38065812 × 10−20	mJ/K	Boltzmann’s constant
T	273.15 + 22	K	Absolute temperature (corresponds to room temperature at 22 °C)
${\upsilon }_B=\frac{kT}{q}$	25.43	mV	Boltzmann’s potential
RIn	100	MΩ	Input resistance
Cm	130	pF	Membrane capacitance
υNa	70	mV	Reversal potential for Na+
υK	−90	mV	Reversal potential for K+
υL	−60	mV	Reversal potential for leak
āNa	13	nA	Maximal amplitude for DmNaυ current
āK	[13, 65]	nA	Maximal amplitude for Shab current
āL	0.5	nA	Constant amplitude for leak current
$a_{Na}=\frac{{\overline{a}}_{Na}}{{\overline{a}}_{Na}}$	1		Normalized amplitude for DmNaυ current
$a_K=\frac{{\overline{a}}_K}{{\overline{a}}_{Na}}$	[1,5]		Normalized amplitude for Shab current
$a_L=\frac{{\overline{a}}_L}{{\overline{a}}_{Na}}$	0.04		Normalized amplitude for leak current
$\xi =\frac{{\overline{a}}_{\mathrm{Na}}}{C_m}$	100	nA/nF	Scaling factor for physiologically relevant dυ/dt
υm	−28	mV	Half-activation for DmNaυ (Lin et al. 2009; O’Donnell Olson et al. 2008)
υw	−1	mV	Half-activation for Shab (Tsunoda and Salkoff 1995b)
ηm	2		Gating charge of activation for DmNaυ (estimated from Lin et al. 2009)
ηw	2		Gating charge of activation for Shab (Tsunoda and Salkoff 1995b)
τ̄w	5 or 10	ms	Maximum time constant for Shab (estimated from Tsunoda and Salkoff 1995b)
σw	0.3 or 0.7		Symmetry of time constant for Shab (estimated from Tsunoda and Salkoff 1995b)