Best intra-subject variability estimate based on overall similarity.

For each pair of intra-subject threshold noise να and slope noise νβ, the overall similarity (combined for threshold, slope, and lapse rate) averaged across Nsimulations = 1000 simulations () is represented as a heat map. The dashed white iso-reliability contour is identical to Fig 3. The noise level pair on the contour with the highest overall similarity () is indicated with a black dot.