Abstract
This chapter discusses the two sets of channels that originate in the mammalian retina, the ON and OFF systems and the midget and parasol system. The midget and parasol systems of the primate retina come in ON and OFF subvarieties. The midget system has also been called the color-opponent or the parvocellular channel and the parasol system has also been called the broad-band or magnocellular channel. The receptive fields of the midget system, as the name implies, are quite small. In central retina, the receptive field center is typically made up of a single cone. As a consequence, the midget cells are color coded. Midget cells come in several subvarieties that include red ON- and OFF-center; green ON- and OFF-center; and blue ON-center. Blue OFF-center cells are rare. In contrast to the arrangement for the midget cells, the receptive fields of parasol cells are much larger and generally, there is no clear differential input from the three cone types to either the center or the surround regions of these cells.
Published Version
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