FIGURE 5 | Changes in the temporal pattern of spikes generated by an SC neuron in response to moving stimuli at different velocities and in the same direction. (A–C) Raster plots for three stimulus velocities: 10, 50, and 200 deg s − 1 , respectively. (D–F) Corresponding PSTHs (100 bins). (G–I) ACHs computed from the PSTH reveal the presence of stimulus-phase-locked oscillations for velocities above 10 deg s − 1 . (J–L) Amplitude spectra prepared from (G–I) . (M) Plot of the strength of oscillation index (SO) as a function of stimulus velocity showing a positive correlation between the SO and stimulus velocity for this neuron. (N) The position of the RF in the visual field. Stimulus motion (indicated by the arrow) was directed away from the area centralis (AC). Note the changing temporal structure and increasing synchronization the of the responses in the raster plots and PSTHs as stimulus velocity increases, which is confirmed in the power spectrum analysis and is associated with a decrease in the firing rate at the beginning of the response, clearly visible for 200 deg s − 1 in plot (C,F)