Passive membrane properties of the stellate neuron models.

Input resistance (Ri) was defined as the ratio of the
steady-state voltage change in response to positive
(“+”) or negative
(“−“) current injection from the resting
membrane potential. Monoexponential fits to the initial voltage response
were used to obtain the membrane time constant (τm).
The sag ratio is calculated as the ratio of the peak hyperpolarization
divided by the steady-state hyperpolarization for the negative current
injection. Parameter estimates from the stochastic models were
determined from an average of 5 simulations. Errors are the standard
deviation.