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Simulation of an experiment on a subject with μ = 0 and σ = 1 with 50 stimuli spaced uniformly from −4σ to +4σ. The black dots show the subject’s binary response (0 or 1) to each stimulus. In this experiment the subject responds 0 if they perceive a negative stimulus and 1 if they perceive a positive stimulus. The solid line is the actual underlying psychometric function and the broken line is the maximum likelihood Gaussian fit to the data
