Fig. 3.

Perceptual binary choice and confidence data summary from 12 subjects. A–E: a Gaussian psychometric function (solid black curve) was fitted to binary choice data (black circles), and a Gaussian confidence function (solid gray curve) was fitted to confidence data (gray circles) at individual stimulus durations. x-Axis is stimulus level in tilt. Left y-axis is % responding + for the binary responses and % confidence that the stimulus is + for confidence responses. Right y-axis shows the confidence interpreted by subjects (% correct). F–J: confidence histograms with 11 confidence bins. K: choice threshold (solid black) and confidence threshold (solid gray) in terms of stimulus duration. L: confidence factor as a function of stimulus duration. Error bars show 95% confidence interval.