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- W4385690306 abstract "Frequency-modulated “chirp” stimuli that offset cochlear dispersion (i.e., input compensation) have shown promise for increasing auditory brainstem response (ABR) amplitudes relative to traditional sound stimuli. To enhance ABR methods with marine mammal species known or suspected to have low ABR signal-to-noise ratios, the present study examined the effects of broadband chirp sweep rate and level on ABR amplitude in bottlenose dolphins and California sea lions. “Optimal” chirps were designed based on previous estimates of cochlear traveling wave speeds (using high-pass subtractive masking methods) in these species. Optimal chirps increased ABR peak amplitudes by compensating for cochlear dispersion; however, chirps with similar (or higher) frequency-modulation rates produced comparable results. The optimal chirps generally increased ABR amplitudes relative to noisebursts as threshold was approached, although this was more obvious when sound pressure level was used to equate stimulus levels (as opposed to total energy). Chirps provided progressively less ABR amplitude gain (relative to noisebursts) as stimulus level increased and produced smaller ABRs at the highest levels tested in dolphins. Although it was previously hypothesized that chirps would provide larger gains in sea lions than dolphins—due to the lower traveling wave speed in the former—no such pattern was observed." @default.
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- W4385690306 date "2023-08-01" @default.
- W4385690306 modified "2023-09-26" @default.
- W4385690306 title "Input compensation of dolphin and sea lion auditory brainstem responses using frequency-modulated up-chirps" @default.
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- W4385690306 doi "https://doi.org/10.1121/10.0020566" @default.
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