Boundary curve slope in a psychometric function quantifies listener response certainty.

Evidence

It is uncommon to use a yes/no paradigm and a signal detection theory framework when an estimate of threshold is desired. Consequently, a number of strategies can be taken by an experimenter to ensure that listeners adopt neutral criteria. In the research realm, the forced-choice paradigm is extremely popular, as the criterion will be applied to both observation intervals and is effectively canceled out. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 341 (#complicates, via linked claim)

Categorization

• XREF: connects to: Shallow psychometric slopes reflect listener response uncertainty; A multi-category psychometric function maps response category probabilities onto stimulus level — Dijk, Pim van, Physiology, Psychoacoustics and…, 2512; Boundary-curve slope in a categorical loudness function encodes perceptual category certainty — Dijk, Pim van, Physiology, Psychoacoustics and…, 2549 (+2 more)

Broader Connections

• Shallow psychometric slopes reflect listener response uncertainty #corroborates (0.93)
• Forced-choice testing cancels listener response criterion effects in threshold estimation #complicates (0.72) — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 341