Demonstration that A-waves are not immediately generated by the first pair in the run. Abscissa, ms; ordinate V. Solid trace: The response to a single Dau-chirp presented at 15 S/s using a q- sequence. Dotted trace: The response to the second of a pair of Dau-chirps with the timing between the pair at 14 ms (the period of 70 S/s). The timing from start-of-pair to start-of-pair was 15 S/s, using the same q-sequence. See text for the method of extracting and shifting this waveform. Dashed trace: The response to the same Dau-chirps when they are presented in a jittered q-sequence, mean of 70 S/s. NOTE: The dotted trace is mid-way between the solid and dashed traces within the first 120 ms, i.e., the response to the second stimulus of the pair does not equal the response to continuous stimulation.