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I basically agree with @Nick Stauner, but I want to add another important aspect, namely the gradient of photoreceptor densities in the human retina: In the fovea there is a sharp peak in cone density compared to more eccentric regions, as described in Curcio et al. (1990) and see the graph in Web Vision. But admittedly, rod receptor densities surrounding ...


What are you trying to do? If you're trying to leverage pupil-dilation data from an eye-tracker, there are ways to deconvolute the timeseries if you can make a strong inference as to exactly when the stimulus of interest took place. I think you'll find everything you're looking for here.

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