Abstract
Two experiments concerning the effects of masking on the brainstem evoked response (BER) are reported. The first experiment evaluated the effects of noise level and rate on waves I, III, and V. There was an increase in peak latencies and a decrease in peak amplitudes with increasing noise level and rate. Higher noise levels and rates increased the I–V interval, and produced a greater increase in the III–V than the I–III interval. The second experiment used the high-pass subtractive-masking technique and covaried derived-response bandwidth and within-band noise level. For half-octave derived bands, the within-band wave V latency at higher noise levels was greater than the unmasked latency of the immediately apical band. The magnitude of within-band noise-induced wave V latency shift was independent of response bandwidth. The relatively large within-band noise-induced wave V latency shift combined with the increasing I–V interval with increasing noise level suggest that a shift in cochlear region of response emanation is not responsbile for most of the wave V latency shift with increasing noise level. [Work supported by NIH.]
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