The dynamic range of visual coding is extended by having separate ganglion cell types that respond to light increments and decrements. While the primordial color vision system in mammals contains a well-characterized S-On center ganglion cell, less is known about S-Off counterparts. We identified a regular mosaic of S-Off ganglion cells in the ground squirrel. Contrary to convention, S-Off center responses come from an S-On bipolar and inverting amacrine cell.
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