Abstract
Greenwood [J. Acoust. Soc. Am. 51, 502–543 (1971)] has shown that for steady-state masker conditions, in which the signal is a long-duration pure tone and the masker is a continuous pure tone, a notch appears in the masked audiogram. This notch at the high-frequency side of the masker is caused by the detection of combination tones on the low-frequency side of the masker. The present study investigated the importance of combination tones in temporal masking. A 5-msec tonal signal was presented at various delays relative to onset of a longer-duration sinusoid. Under the forward-masking condition, the previously described notch in the masked audiogram was not obtained. Signal threshold was found to be a monotonically decreasing function of the difference between signal and masker frequency. In a second study, temporal masking was investigated using two pure tones as a complex masking stimulus. The combination tones that were formed by the masker produced masking effects on the low-frequency side of the masker comparable to those recorded under steady-state conditions. Some implications of these results for the formation of combination tones are discussed. [This research was supported by an NIH grant.]
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