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Average discharge rate (left) and synchronization index (right) of five fibers as a function of modulation depth for three modulation frequencies (rows). Each symbol represents data from one fiber. Transient responders are represented by dashed lines, sustained responders by solid lines. The synchronization index is only plotted if the response includes at least 100 spikes. Shading indicates the range of normal acoustic responses to low-frequency pure tones.
