Spaceindependent behavior

If we assume that the light stimulus is spatially uniform, then spatial dependence can be ignored, and the model equations reduce to the ordinary differential equations dE

dt dI

If L is a unit step applied at time t = 0, then the response at subsequent times is

where k = 1/t. R is graphed in Fig. 22.12A, from where it can be seen that the response is an initial peak followed by a decay to a plateau.

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