Changes in tuning with respect to stimulus complexity in the population of observed RGCs. a) Neural response to speed for four representative cells: For each type of moving stimulus at their preferred spatial frequency, we show their relative firing rate and its fit to a skewed Gaussian. The blue line corresponds to the response to gratings, the green the response to MC of narrow spatial frequency bandwidth and the yellow to broad bandwidth. We also indicate preferred speed (\(pv\)) and tuning bandwidth (\(\sigma_{v}\)). Here, we show representative examples of cells with narrower tunings for MC, with the ones on the left column changing their preferred speed and bandwidth, while the ones on the right changing their tuning bandwidth but preserve their preferred speed. b) This scatter plot shows the joint distribution of the \(\sigma_{v}\) parameter for each of the speed responsive cells, plotted as the value obtained for the grating against the value obtained for the MC. We distinguish the narrow bandwidth by blue circles and the broad bandwidth MC by red triangles. In the marginal histograms, it can be seen that the distribution of values for gratings is skewed towards higher values, while the marginal distributions for both types of MC are more centered. The joint distributions are biased below the equality diagonal in both comparisons, meaning that the \(\sigma_{v}\) values for gratings are larger for a considerable number of cells. The quantification of these differences was measured by the normalized difference between the \(\sigma\) values (\(\Delta\sigma\)) between the response to grating and MC for each cell. As shown in c), the distribution for both comparisons is skewed to the right, meaning that a large portion of the speed responsive cells have a narrower tuning when stimulated with the complex stimulus. To quantify this difference, we classified cells in two classes: The cells whose \(\sigma\)grating is larger than \(\sigma\)motioncloud (\(\Delta\sigma>1\) s.d.) are considered as cells with decreased bandwidth, and cells with negative values are considered as cells with increased bandwidth (\(\Delta\sigma<-1\) s.d.); cells with \(\Delta\sigma\) within \(\pm 1\) s.d. are considered as cells with unchanged bandwidth. The proportions of cells classified as each of these types is shown in d); the bar plot shows the mean and standard deviation for 10000 trials of subsampling \(50\%\) of the cells. As seen, the largest proportions corresponds to cells with narrower tunings to speed.