Figure 5.

Averaged responses of +/+ rods (A) and +/− rods (B) to 500-nm flashes of increasing strength. Responses are normalized to maximal response amplitudes (18 pA for the +/+ rod and 12 pA for the +/− rod). Traces underneath are signals from flash monitors. Photoresponse recovery is faster in the +/− rod. (C) Normalized response amplitudes from A and B plotted against flash strength. Lines show fit of the data to a saturating exponential: r/r_max = 1 − e^−ki, where i is the flash strength, k = ln(2/i₀), and i₀ is the flash strength giving rise to a half-maximal response. For the +/+ rod, i₀ was 30.6 photons⋅μm⁻²; for the +/− rod, i₀ was 182 photons⋅μm⁻².