title: Binaural interaction in human auditory brainstem response compared for tone-pips and rectangular clicks under conditions of auditory and visual attention.
abstract: Binaural interaction in the auditory brainstem response (ABR) represents the discrepancy between the binaural waveform and the sum of monaural ones. A typical ABR binaural interaction in humans is a reduction of the binaural amplitude compared to the monaural sum at the wave-V latency, i.e., the DN1 component. It has been considered that the DN1 is mainly elicited by high frequency components of stimuli whereas some studies have shown the contribution of low-to-middle frequency components to the DN1. To examine this issue, the present study compared the ABR binaural interaction elicited by tone pips (1 kHz, 10-ms duration) with the one by clicks (a rectangular wave, 0.1-ms duration) presented at 80 dB peak equivalent SPL and a fixed stimulus onset interval (180 ms). The DN1 due to tone pips was vulnerable compared to the click-evoked DN1. The pip-evoked DN1 was significantly detected under auditory attention whereas it failed to reach significance under visual attention. The click-evoked DN1 was robustly present for the two attention conditions. The current results might confirm the high frequency sound contribution to the DN1 elicitation.
authors.affiliation: Center for the Research and Support of Educational Practice, Tokyo Gakugei University, Koganei, Tokyo, Japan. Electronic address: kazunari@u-gakugei.ac.jp.
authors.forename: Kazunari
authors.initials: K
authors.lastname: Ikeda
mesh_terms: D000161:Acoustic Stimulation; D000328:Adult; D001288:Attention; D001299:Audiometry; D001933:Brain Stem / Q000502:physiology*; D004569:Electroencephalography; D004594:Electrophysiology; D016057:Evoked Potentials, Auditory, Brain Stem / Q000502:physiology*; D005260:Female; D006309:Hearing; D006801:Humans; D008297:Male; D011930:Reaction Time; D055815:Young Adult