Interactions leading to colour opponency in ganglion cells of the turtle retina

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Abstract
In the turtle retina, color-dependent photoresponses could be recorded intracellularly from ganglion cells receiving only bipolar cell input. The mechanism for color discrimination by these ganglion cells (type A) is contained in the outer plexiform layer of the retina and depends on interaction between horizontal and cone cells. Ganglion cells receiving an additional amacrine input (type B) are not influenced by color and have about 0.7 logarithmic unit lower absolute sensitivity to peak wavelength than have type A ganglion cells.