Electrical Stimulation of Mammalian Retinal Ganglion Cells Using Dense Arrays of Small-Diameter Electrodes - Artificial Sight: Basic Research, Biomedical Engineering, and Clinical Advances - page 341

Figure 18.5. Threshold-duration relationships. Current necessary to evoke a spike is
plotted as a function of pulse duration for 5 cells from three species.
generated. We used our setup to successfully stimulate 3 cells at frequencies
up to 100 Hz. At such frequencies, spikes evoked at longer latencies >2ms
showed a dramatic decrease in response rate, while short-latency spikes could
be evoked much more reliably.
Figure 18.6. Simultaneous stimulation at multiple sites. Two nearby electrodes on the
array were used to stimulate two ganglion cells independently of each other. The spike
responses (arrows) are shown on the left and right, respectively.