Equations for the seven base Type 2 Confidence models.

The models consider the decision evidence, Ev(), in favour of the perceptual choice, r, given the dot measurements, X, and Type 1 decision criterion, k1. The DFC Evidence-Strength models take a point estimate of the posterior’s mode (), with or without scaling by the posterior’s spread (), and compare its unsigned distance from k1. Confidence forced-choice judgements involve comparing the relative confidence evidence for the intervals (w1 versus w2), with an influence of a confidence interval bias, k2.