Psychometric functions map continuous stimulus scales onto probabilistic detection judgements
Evidence
Figure 2–12 illustrates a psychometric function, which plots the percentage of sound detections as a function of signal level in dB SPL. In the example illustrated here, the method used to determine the response to a given stimulus was a yes/no task. In a yes/no task, a listener is given an observation interval in which the stimulus is either present or not. The listener then responds either “yes, I heard a signal” or “no, I did not hear a signal.” — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 284
Categorization
- DEFINE: Defines the psychometric function and the yes/no task that generates it.
- corroborated: 2 independent passages support this claim — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 284
- XREF: connects to: Adaptive procedures converge on thresholds without explicit psychometric functions — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 351; Psychometric functions require prior knowledge of useful stimulus levels; One-up two-down adaptive procedures track the 70.7% point on the psychometric function (+2 more)
Broader Connections
- One-up two-down adaptive procedures track the 70.7% point on the psychometric function
#expands(0.85) - Psychometric functions require prior knowledge of useful stimulus levels
#qualifies(0.80) - Loudness judgments at a fixed level vary probabilistically across categories
#exemplifies(0.75) — Dijk, Pim van, Physiology, Psychoacoustics and…, 2512