Noise-burst masked thresholds rise more gradually than tone-burst thresholds with shorter duration

Evidence

Thresholds for noise bursts masked by uniform masking noise, however, show a somewhat different dependence indicated in Fig. 4.19 by solid lines. Approaching from steady-state condition, i.e. from large durations, the masked threshold increases somewhat more gradually as duration decreases in comparison with the increase measured with tone bursts. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 496