Individual detection scores for 5%, 5-Hz probe modulation of a white-noise (open symbols) and bandlimited-noise (filled symbols) carrier, measured for four listeners (columns). Carrier modulation frequency of the second-order SAM masker was fixed at 64 (diamonds, upper row), 180 (triangles, middle row), or 2000 Hz (circles, lower row). The modulation depth of the 5-Hz SAM masker (bold line, lower row) was set to 5%. Unmasked probe detection scores are indicated for the white-noise (long-dashed line) and bandlimited-noise (short-dashed line) conditions. The dotted line represents performance at chance level.