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
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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