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Psychometric functions for the A on B condition in each of four stimulus dimensions. Functions were sampled at 200 trials per target contrast level. There is evidence for nonmonotonicity and negative d-prime within each dimension. Above each plot are high contrast examples of the stimuli and icons indicating the arrangement of the A and B stimuli. The dimensions were (a) space, (b) time, (c) eye, and (d) orientation. Error bars are binomial errors.
