Suprathreshold perceptual decisions constrain models of confidence
Fig 6
Elements of the decision models.
Depicted is the estimated joint probability of the dot-cloud generating distribution mean and precision for an example stimulus presentation of 2 dots. A) Centred Normal-gamma prior distribution (based on the stimulus statistics of the experiment), likelihood function based on the noisy dot observations, and the resulting normal-gamma posterior distribution. All three distributions have the same axes as the ones shown in the posterior panel. B) The marginal prior (grey), likelihood (orange), and posterior (blue) for estimating the generating distribution mean. An unbiased Type 1 decision criterion, k1, is also depicted. Inset: the displayed and perceived locations of the two sampled dots, with the dashed line indicating the screen midline.