SNR discrimination worsens at favorable signal-to-noise ratios

Evidence

The SNR JNDs at the three SNR references of ‑6, 0 and + 6 dB SNR were 2.8, 2.9, and 3.7 dB respectively; the first two were statistically no different and both less than the third [t (91.3) = 4.07; p = 0.0001 and t (121.4) = 4.11; p = 0.00007, respectively]. — Dijk, Pim van, Physiology, Psychoacoustics and…, 5669

Categorization

• QUESTION: Why would the JND grow (from ~2.9 to 3.7 dB) specifically at the +6 dB favorable reference SNR? Worth chasing whether ceiling effects, loudness cues, or reduced neural synchrony explain this asymmetry.