[[Image:arbors2.png|thumb|400px|ON-center orientation selective ganglion cell to the left. OFF-center orientation selective ganglion cell to the right. <ref name="Amthor1">Amthor FR, Takahashi ES, Oyster CW (1989) Morphologies of rabbit retinal ganglion cells with concentric receptive fields. Journal of Comparative Neurology 280:72-96. [http://onlinelibrary.wiley.com/doi/10.1002/cne.902800107/abstract]</ref>]]