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Bias (mean of CDF) and threshold (sigma of CDF) for the test stimulus without an adapting stimulus by subject. The final column represents the CDF fit from all the responses combined across subjects (C). Filled symptoms represent a visible FP, and open symptoms represent trials done in darkness with NF. A Bias of the psychometric function with error bars representing the 95 % confidence interval. B Thresholds for the FP and NF conditions.
