Example histological images (adjacent sections were stained with Luxol fast blue – Periodic Acid Schiff (LP) for the visualization/identification of myelin) panels A–C extra-calcarine histological samples, same location reported in Fig. 4D but different histological stains (Fracasso et al., 2016). Panels D–F, extra-calcarine histological samples, same location reported in Fig. 3D but different histological stains (Fracasso et al., 2016), green arrows point to locations where a highly-myelinated band is present.