Auditory brainstem responses (ABRs) were measured to the onset of narrowband-noise trailing markers in the within-channel and across-channel conditions. ABRs have been measured in the context of within-channel gap detection, where gap thresholds defined by the presence of clearly peaked ABRs corresponded well to psychophysical gap thresholds of the same listeners. Ten male students participated in this study. No participants had any known hearing deficits or difficulty in listening to the stimuli used in the experiment, and they gave written informed consent prior to the experiment. There were five combinations of center frequencies of the leading and trailing markers. In the stimulus with no gap, the offset of the leading marker overlapped with the onset of the trailing marker, so that there was no amplitude decrement in the stimulus. For 800/800 and 1,600/800, the amplitudes remained low up to 1GT and jumped to a high level at 1.5 GT. For 800/1,600, the amplitude increased at 1 GT. For 800/3,200 and 3,200/800, the amplitudes increased at 0.5 GT but showed no significant increase thereafter.
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