Auditory sensitivity varies nonuniformly across the frequency range

Evidence

For pure sine waves, however, the sensitivity to change is markedly different and is a strong function of both amplitude and frequency. For example, at 1 kHz, the just-noticeable amplitude change varies from 3 dB at 10 dB(SPL) to 0.3 dB at 80 dB(SPL). — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 648

Categorization

• corroborated: 2 independent passages support this claim — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 648
• XREF: connects to: Physical frequency is the wrong scale for describing inner-ear effects; Just-noticeable frequency shifts map to constant basilar distances — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 929; Normal hearing is most sensitive near 2 to 5 kHz — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 168 (+17 more)