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. Author manuscript; available in PMC: 2012 Sep 15.
Published in final edited form as: Vision Res. 2011 Aug 9;51(18):1995–2007. doi: 10.1016/j.visres.2011.06.020

Figure 3.

Figure 3

An example of a psychometric function for letter recognition. Recognition performance was obtained for six cutoff frequencies as measured in CPO. This was achieved by fixing the cutoff retinal spatial frequency at 1.5 CPD and using six image sizes. The images below the psychometric function show a sequence of images, all with the same cutoff frequency of the filter measured in CPD (i.e., 1.5 CPD) but different cutoff frequencies measured in CPO depending on the size of the stimulus image.