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Experiment 3: Probability of selecting the target as a function of contrast of both target and distractor. Data from individual observers. The line is the ML best fit. Individual thresholds are given by contrast values corresponding to 75% level performance and are, respectively, 0.21 ± 0.007, 0.35 ± 0.88, 0.30 ± 0.02, 0.20 ± 0.02, 0.32 ± 0.02. The dashed line indicates the guessing level for this task (0.5 probability).
