Abstract
The detection of amplitude modulation of a sinusoidal (target) carrier can be impaired by the presence of a modulated sound (interferer) with a different carrier frequency, referred to as modulation detection interference (MDI). Typically, sinusoidally amplitude-modulated tones remote in frequency are used as the interferer, and the target modulation threshold is increased if the interferer- and target-modulation rates are similar. In the present study, narrow-band noise was used as the interferer. Detection thresholds for modulations of 5, 10, and 50 Hz imposed on tone carriers were measured as a function of noise bandwidth (0–200 Hz), the spectral distance between the carrier and interferer (0.5–4 octaves), the carrier level (40–80 dB SPL), and the carrier-interferer level difference (0–30 dB). In all conditions, the intrinsic fluctuations of the noise interfered with modulation detection, with maximum interference at noise bandwidths about twice the modulation frequency. This bandwidth dependence corresponds directly to that found in ‘‘on-frequency’’ conditions with narrow-band noise carriers; however, the interference is much smaller. An across-channel modulation-filterbank model is used to describe the similar bandwidth dependence and the different overall effectiveness of the on- and off-frequency interferer. [Work supported by the Deutsche Forschungsgemeinschaft.]
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