Fig. 4.

The connections between cones, horizontal cells and bipolar cells in the model (Lebedev, 2003). Electrical coupling between L and M cones and between horizontal cells (HC) is indicated by dashed lines. Sign conserving synapses are indicated by triangles and sign inverting synapses by circles. Horizontal cells receive equal numbers of inputs from L and M cones and are depicted in yellow to indicate their lack of selectivity. Model midget bipolar cells each receive inputs from a single L or M cone. A version for readers with red-green color blindness is available in Supplemental Materials Online.