Postmasking decay needs two separate time constants depending on masker duration

Evidence

The astonishing effect that postmasking depends on the duration of the masker is clearly outlined in Fig. 4.23. This effect can be modelled more easily in the specific loudness versus critical-band rate versus time pattern described in detail in Sect. 8.7.1. If the duration-dependent decay of postmasking is transformed into an excitation-time pattern, which is transformed further into a specific loudness versus time pattern, then the decay can be simulated by two time constants. One is very quick and effective in the case of short maskers while the other acts more slowly Bnd is seen with a masker duration longer than 100 ms. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 646

However, the decay of post masking is much shorter than might be expected from Fig. 4.22. This difference can be understood from the fact explained in Fig. 4.23; post masking depends on the duration of the masker. For the temporal masking pattern displayed in Fig. 4.24, the duration of the masker is only 50 ms, i.e. much shorter than the 200 ms of Fig. 4.23, and the decay of post masking is therefore steeper. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 525

Categorization

• corroborated: 2 independent passages support this claim — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 646; Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 525