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Stimuli were amplitude-modulated trains of biphasic pulses. Individual pulses cannot be resolved because of the high carrier rate (1000 pps). Top, envelopes comprised single cycles of sinusoidal modulation interleaved with silent intervals. Bottom, envelope burst width and modulation rate were independently varied as shown in the grid. For clarity, the first 96 ms of each waveform is shown; actual stimulus duration was 288 ms.
