Simultaneous-masked PTCs are broader than forward-masked PTCs, with similar overall shape

Evidence

Moore, Glasberg, and Roberts (1984) measured PTCs for a tone presented at 10 dB SL and at four different frequencies under both simultaneous and forward masked conditions. They found that that simultaneousand forward-masked PTCs have a very similar shape, as shown in Figure 3–15. However, we see a striking difference between the two types of PTCs. The PTC measured using simultaneous masking was broader than the PTC measured using forward masking. We also observe evidence of upward spread of masking in the shallower low-frequency tail in both simultaneousand forward-masked conditions, suggesting that upward spread of masking is a robust property of the auditory system. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 532

Categorization

• XREF: Connects to earlier physiological tuning curves from the basilar membrane (Figure 3-4), per the passage’s own comparison.