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Figure 3.6 : (C) Inductive Ih model. Response of rod (A) and cone (B) photoreceptors
to hyperpolarizing current steps (shown above) fit to the voltage response of the equivalent
circuit (C) as a function of the parallel inductance Lih and its series resistance R↑. Lih (A3,4)
and Rγ (B3,4) decrease with increasing stimulus intensity. (Al, Al) show the circuit model
predicted resonant frequency for the cell fo, with damping factor a shown in (A2, B2) as a
function of the input current intensity. These parameters change as a function of Li⅛ and
Rχ. Derivation is given in Appendix A.2