Figure 6

The SZ Is Dominated by Broadly Stratifying UV-Sensitive On Clusters

(A–F) Clustering of dendritic ROIs from SZ dataset (for details, cf. Figures 4A–4F). Note that all clusters except for C₁₂ are dominated by On kernels, with C_1–3 showing pronounced UV responses despite the relatively low UV-signal power in the stimulation light (cf. Figure 1B). For corresponding clustering of SZ somata, see Figure S5.

(G and H) Side-to-side comparison of functional stratification profiles of clusters from data across the eye (G; cf. Figure 4C) and from SZ only (H; cf. C). In each case, all cluster stratification profiles of a dataset were sorted by their center of mass in the IPL (from 100%: Off to 0%: On), stacked on top of each other, and normalized to the number of ROIs per IPL depth. In addition, profiles were color coded by their center of mass in the IPL as indicated. Note that most SZ clusters (H) tended to broadly cover much of the IPL with a center of mass near the middle of the IPL (white), although eye-wide stratification profiles (G) instead showed a greater tendency to stratify in either Off (red) or On (green) layers.