Features of the model.

A: decision certainty in a function of slope β and stimulus magnitude σ. Certainty is a smooth and concave function of each one of the two parameters. B: certainty in a function of σ, for β = 1. C: certainty in a function of β, for σ = 0.3[1/s]. The model returns a monotonic, smooth and concave transfer function between both stimulus magnitude σ and slope β, and the decision certainty.