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Illustration of how the percept of a tone sequence is affected by the frequency separation of the tones. The sequence is of the form ABA–ABA–. In this example, the frequency of tone A is fixed at Ffix and the frequency of tone B starts well below that of tone A, at frequency Finit, and is moved towards that of tone A. When the frequency separation of A and B is large, two streams are usually heard. When the frequency separation is small, one stream is usually heard.
