Fig. 2.
Light responses of Mb-type bipolar cells in dark-adapted retinas varied from spiking to graded. Vm in response to 500-ms-long light stimuli (shaded) recorded from axon terminals are shown for 10 representative Mbs. Light intensities (0.07, 0.20, 1.0, and 1,200 photons·μm−2·s−1) are shown at top. The Mbs' ID numbers (1–10) are shown on left. Light responses with voltage transients >9 mV were considered as spiking (Mb1–Mb7) and those with transients ≤9 mV as graded (Mb8–Mb10). Arrows point to small voltage transients during plateau phase of the light response (Mb1 and Mb10, 1,200 photons·μm−2·s−1).