Dependence of steady circulating current and flash sensitivity of salamander rods on background intensity. (A) Relative circulating current in the steady state, Jrel(I) = j(I)/jDark, where j(I) is the steady current and jDark is the dark current. (B) Relative sensitivity, defined as srel(I) = s(I)/sDark, where s(I) is the absolute sensitivitly and sDark is its dark-adapted value. (C) Relative fractional sensitivity, defined as Srel(I) = (s(I)/sDark)/Jrel(I);see. Symbols from the present investigation are identified in Table. Symbols from three previous studies are: ○, Hodgkin and Nunn, 1988; □, Matthews et al. 1988, average of seven cells;⋄, Koutalos et al. 1995b, average of six cells. The curves are the predictions of the model set out in the, using the parameters of the “standard” rod listed in Table. The curve in A was obtained from Eq. B7 in. The curves in B and C were obtained by simulating (at a range of background intensities) the response to a dim flash, and determining its peak amplitude.
Dependence of steady circulating current and flash sensitivity of salamander rods on background intensity. (A) Relative circulating current in the steady state, Jrel(I) = j(I)/jDark, where j(I) is the steady current and jDark is the dark current. (B) Relative sensitivity, defined as srel(I) = s(I)/sDark, where s(I) is the absolute sensitivitly and sDark is its dark-adapted value. (C) Relative fractional sensitivity, defined as Srel(I) = (s(I)/sDark)/Jrel(I);see. Symbols from the present investigation are identified in Table. Symbols from three previous studies are: ○, Hodgkin and Nunn, 1988; □, Matthews et al. 1988, average of seven cells;⋄, Koutalos et al. 1995b, average of six cells. The curves are the predictions of the model set out in the, using the parameters of the “standard” rod listed in Table. The curve in A was obtained from Eq. B7 in. The curves in B and C were obtained by simulating (at a range of background intensities) the response to a dim flash, and determining its peak amplitude.
