p077fig02.27 A schematic of the on-center off-surround network that occurs in the mudpuppy retina, including three main cell types: receptors, horizontal cells, and bipolar cells.<BR>||  Mechanism: cooperative-competitive dynamics.<BR>On-center off-surround (Kuffler 1953) cat retina<BR>Subtractive lateral inhibition (Hartline, Ratcliff 1956/7+) limulus retina.<BR>R receptor -> H horizontal -> B bipolar (Werblin, Dowling, etal 1969+) mudpuppy retina.