To measure the response of the retina to visual motion, we used MC \citep{Leon:2012dh}. These are defined as synthetic dynamical textures that mimic some key properties of natural images \citep{Vacher15}, while keeping a precise control over the shape of their spatiotemporal envelope. These textures are parameterized by three parameters for the center of the envelope (size, speed, direction) along with their respective bandwidths. Our protocol has consisted of a set of different sequences with the same motion information (mean speed and spatial frequency), but we progressively varied the spatial frequency bandwidth (i.e. the range of sizes) as this was reported to influence visual motion detection \citep{Simoncini:2012ik}. These match the parameters of the drifting grating stimuli (equivalent to an MC with infinitely narrow bandwidth), and textures with a narrow and a wide bandwidth of spatial frequencies (blue, green and orange ellipses respectively). For the narrow and broad bandwidth textures, amplitude scales with spatial frequency: for the narrow bandwidth the scaling factor is chosen for the spectra to not overlap, while for the broad band stimuli the scaling factor is 1 resulting in \(B_{\text{sf}}=\text{sf}_{0}\), so that each spectrum overlaps with the adjacent one along the line of equal speed.