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Model of pupil responses to illuminance changes.
A. The derivative of the mean dilation was well predicted by a gamma probability density function, which constitutes the RF of the first LTI system.
B. The difference between dilation and constriction was well predicted by another gamma probability density function, which constitutes the RF of the second LTI system. For completeness the observed and predicted dilation according to the first LTI system are plotted.
