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Transition from predominantly fine structure coding to predominantly envelope coding with increasing BF. A, Example of the SAC (black line) and XAC (gray line) of noise responses from a unit of a young gerbil (BF = 900 Hz). The XAC/SAC ratio at 0 ms delay of this unit was 0.09. B, The XAC/SAC ratio at delay = 0 ms, as a function of BF for young (blue circles), middle-aged (yellow triangles), and old gerbils (red squares).
