Figure 3. Determining the dominant time constant of recovery of rods from saturating flashes. A: The set of responses to saturating stimuli of increasing flash intensities was recorded in Ringer’s solution. The same set of responses was recorded after 20 min from the start of dopamine perfusion (data not shown). The flash intensities in these records were 153–3,431 photons ・μm⁻² per flash. B: Plotting the time of recovery from saturation (T_rec) as a function of the flash intensity in log scale in Ringer’s solution (■) and after 20 min of incubation in 2.5-µM dopamine-containing solution (□). The straight lines approximate experimental points with T_rec = C + τDˑln(I). T_rec is defined as the time of regaining 20% of the dark current (see Figure 3A). The dominant recovery time constants (τ_D) are shown near the lines.