Responses to different velocities. (A) Example raster plot showing the activity of the 32 recorded ganglion cells from experiment 2 during 2500ms of movement stimulation with various velocities (2 m/s, 5 m/s, 3 m/s, 2 m/s, 6 m/s). The responses show a precise timing with short latencies to stimulus onset. (B) Summed population PSTH of all units over the single stimuli of all units from (A). (C) Stimulus trace. Note the different stimulus durations due to varying velocities. In (D) and (E) the responses and PSTH to the first stimulus (2 m/s) are shown at higher temporal resolution. Velocities are expressed as velocities of an external object at approximately 30cm distance from the eye (see Methods). (G) Stimulation pattern. A regular grating of 400μm wide black and white bars aligned with the electrode rows was constantly projected onto the retina. Stimulation started by moving the grating up or down. Movement stopped when the edges aligned with the next electrode row (movement 1). The following movement started into the same direction (movement 2) to achieve a grating reversal. Afterwards the movement direction also reversed.