Just-noticeable frequency increments are constant along critical-band rate but rise as pitch strength weakens

Evidence

Therefore, as a first approximation, it is assumed that the just-noticeable difference in frequency can be expressed in an increment along the critical-band rate scale that is independent of frequency, but which increases reciprocally with the pitch strength of the sound in question (pitch strength was discussed in Chap. 5). — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1166

Categorization

• QUESTION: The claim that JND frequency is constant along the critical-band-rate scale regardless of frequency is a strong simplification worth checking against data across the audible range and for complex tones.