FIGURE 4 | Responses of one sSC neuron to moving stimuli of different velocities (20, 100, and 1,000 deg s − 1 ). (A–C) PSTHs of neuronal responses for three velocities). (D–F) amplitude spectra (spectrograms) computed from ACHs for responses above. Power spectra were computed from corrected ACHs after subtracting shift predictors. Changes in the power spectra are coded according to the color bars on the bottom. The right-hand side of the panel shows a single example of the power spectrum (red lines) taken from the region representing the maximum power during the response. Amplitude spectrum computed for the background activity for the same neuron is shown as the blue line. Note the similar pattern of oscillation frequencies for visual stimulation and background