Prerequisite properties for motion detection. (a) Schematic diagram of frame pixel processing and time-scale of dynamic and static information at different moving speeds. ΔIPSC responses at (b) different AA concentrations (25, 50, 100 mM, 7.95 mW/cm²) and at (c) different light intensities (4.73, 7.95, 10.75, 12.94 mW/cm², 25 mM). (d) t_max and t₀ at different AA concentrations (25, 50, 100 mM) and different light intensities (4.73, 7.95, 10.75, 12.94 mW/cm²). (e) Schematic diagram of information filtering at different time scales (light intensity of 4.73 mW/cm², AA of 25 and 100 mM). (f) LTP and LTD curves generated by respective optical and electrical pulses in 0.5, 1.0, 5.0 mM DA solution.