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Psychometric functions showing proportion of trials in which the target discs were judged as having a larger mean size than the reference (fixation) disc as a function of the mean area of the target disc set. Data were fit by Weibull functions obtained using the Psignifit algorithm (Wichman & Hill, 2001). Target elements were to the left or right of fixation. Each datum point in the psychometric functions is based on approximately 40 observations.
