Low-pass noise cutoff discrimination degrades with level while high-pass cutoff does not

Evidence

It is interesting to realize that the just-noticeable difference in cut-off frequency increases with increasing level for low-pass noise (see left part of Fig. 7.12), but that just-noticeable difference in cut-off frequency for high-pass noise remains independent of level (see right part of Fig. 7.12). — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1074

Categorization

• QUESTION: Why would level dependence differ so systematically between low-pass and high-pass noise — an asymmetry worth chasing in later auditory-neurophysiology reading.
• corroborated: 2 independent passages support this claim — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1074
• XREF: connects to: Higher noise levels reduce sensitivity to cut-off frequency changes; Higher auditory thresholds predict smaller low-side suppression only at high signal levels — Dijk, Pim van, Physiology, Psychoacoustics and…, 949; Low-level tones mask lower frequencies more than higher ones, reversing at high levels (+2 more)

Broader Connections

• Low-level tones mask lower frequencies more than higher ones, reversing at high levels #corroborates (0.75)
• Higher auditory thresholds predict smaller low-side suppression only at high signal levels #complicates (0.72) — Dijk, Pim van, Physiology, Psychoacoustics and…, 949