Fig. 1.

(A) Averaged click-evoked EcochG obtained from all participants (+/− standard deviation, SD). Baseline (B) was defined as the first amplitude point > 2 SD above the mean pre-onset amplitude (−2 to 0 ms). When extracted by visual inspection, the SP is defined as the difference between baseline and the last inflection point on the rising phase of the first waveform peak; N₁ is defined as the amplitude difference between SP and the first peak (1–2 ms after stimulus onset). (B) A low-pass (3.3–470 Hz; red) and high-pass (470– 3000 Hz; blue) filtered version of the mean wideband waveform from (A). SP^* is defined as the baseline-to-peak amplitude of the first wave on the low-passed waveform; N₁^* is defined as the trough-to-peak amplitude of the first wave on the high-passed waveform. (B) indicates the latency at which baseline is measured. (C) Superimposed waveforms show the overlap of the low-pass component with the wideband (original) waveform in the first 0.5 ms, where SP dominates the response (arrowhead). The dotted line indicates the latency of the inflection point where N1 rises from the SP.