Figure 1.
(A–D) Waveforms and spectra of the stimuli (positive polarity). “High” stimuli (A,B) are 216 Hz; “low” stimuli (C,D) are 162 Hz. “Strong” stimuli (A,C) are 65 dB (SPL); “weak” stimuli (B,D) are 60 dB (SPL).
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