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. Author manuscript; available in PMC: 2009 Aug 1.
Published in final edited form as: Vision Res. 2008 Jul 21;48(18):1859–1869. doi: 10.1016/j.visres.2008.06.006

Figure 2.

Figure 2

A sample psychometric function generated by the model, for a two-alternative forced choice stimulus detection task. Solid circles represent the stimuli presented and their probabilities of detection. Solid vertical lines passing through these circles represent the 90% confidence interval for this probability. The dashed vertical lines represent the median and lower and upper quartiles of the fitted curve, corresponding to 25%, 50% and 75% detection probabilities. This psychometric function has a detection threshold of 12.6% contrast and a slope parameter of 2.1.