A psychophysical detection threshold does not ensure subjective meaningfulness of the change
Evidence
The current study looked at both of these: how large a change in signal-to-noise ratio (SNR) has to be for it to psychophysically discriminable or clinically meaningful. This is a curiously under-studied area: previously there has been only one small study related to measuring the just-noticeable difference (JND) in SNR by Killion ( 2004 ), in which unspecified participants were at chance discriminating a 2 dB SNR difference for speech in noise. … A JND, though, is just a psychophysical benchmark; it is not clear a priori that a change of one JND is necessary or sufficient for the change to have any subjective importance to an individual. — Dijk, Pim van, Physiology, Psychoacoustics and…, 5669
Categorization
Category: Definitional Content
- DEFINE: Distinguishes JND (psychophysical detectability) from JMD (just meaningful difference), a key conceptual distinction.
- QUESTION: What determines whether a detectable change becomes subjectively important — a gap this chapter is probing.
Related
- A just-noticeable difference in signal-to-noise ratio does not guarantee subjective value (similarity 0.93)
- A psychophysical JND in signal-to-noise ratio does not guarantee subjectively meaningful benefit to patients (similarity 0.88)
- The just-noticeable difference for speech in noise was nearly unstudied until recently (similarity 0.88)
- Detection threshold for SNR change in sentences averages about 3 dB (similarity 0.87)
- Detectability alone fails to capture what hearing benefit users deem meaningful (similarity 0.85)
- Meaningful speech-in-noise benefit requires double the detectable SNR change (similarity 0.84)
- The JND is the smallest intensity change the ear can discriminate (similarity 0.84)
- Listeners only rate a speech-quality change as meaningful when it exceeds detectability thresholds (similarity 0.83)
- Psychoacoustics measures detection, discrimination, magnitude, and recognition of sounds (similarity 0.83)
- SNR just-noticeable difference grows from about 3 to 3.7 dB at positive reference SNRs (similarity 0.83)
- Meaningful hearing benefit emerges at 4 dB SNR regardless of presentation order (similarity 0.82)
- Listeners may judge SNR changes via perceived intelligibility rather than raw signal level (similarity 0.82)
- Intensity discrimination measures the smallest detectable change in loudness (similarity 0.82)
- Normal-hearing listeners detect a 3 dB change in speech-to-noise ratio (similarity 0.81)
- Listener ratings of speech benefit only become significant once SNR change reaches 4 dB (similarity 0.81)
Broader Connections
- Threshold is a statistical artifact, not a sharp boundary of audibility
#expands(0.90) — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 284