Amplitude discrimination depends on relative loudness increment, not absolute change

Evidence

Just-noticeable differences in amplitude, JNDL, are received as justnoticeable differences in loudness. It seems that it is not the absolute increment of loudness that is responsible for JNDL, but a relative increment. The just-noticeable increment in specific loudness at a certain critical-band rate, or the sum of up to 3 neighbouring specific loudnesses, are the values that seem to be related to the total loudnesses of the two sounds being compared. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1167

Categorization

• XREF: connects to: The ear’s just-noticeable amplitude difference depends on signal type, level, and frequency — David Howard, Jamie Angus, coustics and Psychoacoustics, 636