Differential adaptation in On and Off pathways.

A. Standard deviation for the On and Off pathway outputs of LNK models of eight amacrine and ganglion cells as a function of contrast after normalizing the standard deviation of the entire output to one. Numbers do not sum to one because signals from the On and Off pathways partially cancel. B. Standard deviation (circles) and mean (squares) of the nonlinearity output u(t) in each pathway as a function of contrast. C. Standard deviation of the kinetics block output A(t) in each pathway as a function of the mean input to the kinetics block 〈u〉. A canonical nonlinearity N0 with a threshold at zero was used to generate u(t) as a function of contrast.