Abstract
Thresholds were determined for a 500‐Hz tonal signal in the presence of a noise amplitude‐modulated (NAM) noise, where the carrier was a wideband Gaussian noise and the modulator was a 20‐Hz‐wide noise band centered at 20 Hz. The NAM noise was filtered after modulation to produce a band centered on the 500‐Hz signal. Both diotic (So) and interaurally phase‐reversed (Sπ) signal thresholds were determined as a function of masker bandwidth (10–1000 Hz). When the masker was presented diotically, So thresholds (and to a lesser extent, Sπ thresholds) first increased, then decreased as a function of masker bandwidth, thus showing the effects of comodulation masking release at the wider bandwidths. The masking‐level difference (MLD, i.e., the difference between So and Sπ thresholds) increased as masker bandwidth decreased, as it did with a random (unmodulated) noise masker. When the masker was presented such that the noise carrier was diotic but the noise modulators were independent at the two ears, a sizable MLD still occurred (5–10 dB), but the MLD decreased with decreasing bandwidth. The decreased MLD at small bandwidths resulted from the higher Sπ thresholds with this stimulus than with a true diotic masker, which can be explained by the slowly fluctuating interaural intensity differences that this type of masker produces at narrow bandwidths. [Work supported by NIH.]
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