Abstract
Listeners discriminated pairs of complex sounds, each consisting of two groups of components. Only those components in the lower‐frequency group were resolvable by the peripheral auditory system. For the standard stimulus, the F0's of the two groups were frequency modulated coherently at about 125 Hz, so that they were always equal. For the signal, the two F0's were modulated incoherently so that they differed by an amount that oscillated between values proportional to the depth. of FM. Listeners could perform the discrimination when the zero‐peak FM depth was about 7%, and two findings indicate that they did so by simultaneously comparing the pitches of the two groups of components. First, listeners could do the task when the lower group consisted of only odd harmonics of 125 Hz (pitch = 125 Hz), but not when it consisted of even harmonics (pitch = 250 Hz). This shows that they were not comparing the rate of amplitude modulation, caused by beating between adjacent components in the lower group, to that i...
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