Information per trial as a function of target level derived from an
analytic analysis. Target level is presented both in terms of stimulus level as
a ratio of threshold (A,B,C) and corresponding fraction correct (D,E,F); note
that while presenting different perspectives, these provide redundant
information. We indicate the target level that maximizes information per trial
(circle) regarding threshold (A,D), bias (B,E) and bias and threshold together
(C,F).