Abstract
Spectrum and presentation rate were parameters utilized to evaluate the binaural interaction component (BIC) of the auditory brain stem response (ABR) at 100 dB SPL in normal hearing adults. Binaural brain stem waveforms were similar in morphology to the sums of the monaurals. For stimulus conditions of this study, amplitudes of the binaural wave V were always smaller with shorter latencies (0.1–0.2 ms) than the summed monaural amplitudes and latencies. Increasing stimulus rate produced small increases in response latencies and decreases in peak amplitudes of the N1‐P2 binaural interaction components and concomitantly, an increased latency and decreased amplitude of wave V of ABR. Rate effects at different center frequencies affected the BIC in ways significantly different from known effects of repetition rate on wave V ABR latencies using unfiltered clicks. Both the wave V of ABR and N1‐P2 component of BIC from all subjects consistently evoked shorter latencies to the 2000‐Hz tone bursts than to either 500‐ or 1000‐Hz tone bursts. At low frequencies, a derived frequency following response (FFR) was obtained having latencies and configurations which suggest that its emanation is central, not peripheral or artifactual.
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