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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. \u201cOptimal\u201d 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\u2014due to the lower traveling wave speed in the former\u2014no such pattern was observed.<\/jats:p>","DOI":"10.1121\/10.0020566","type":"journal-article","created":{"date-parts":[[2023,8,9]],"date-time":"2023-08-09T17:06:29Z","timestamp":1691600789000},"page":"739-750","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Input compensation of dolphin and sea lion auditory brainstem responses using frequency-modulated up-chirps"],"prefix":"10.1121","volume":"154","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8090-4733","authenticated-orcid":false,"given":"Jason","family":"Mulsow","sequence":"first","affiliation":[{"name":"National Marine Mammal Foundation 1 , 2240 Shelter Island Drive #200, San Diego, California 92106, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0969-8033","authenticated-orcid":false,"given":"James J.","family":"Finneran","sequence":"additional","affiliation":[{"name":"U.S. Navy Marine Mammal Program, Naval Information Warfare Center Pacific Code 56710 2 , 53560 Hull Street, San Diego, California 92152, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3795-2083","authenticated-orcid":false,"given":"Madelyn G.","family":"Strahan","sequence":"additional","affiliation":[{"name":"National Marine Mammal Foundation 1 , 2240 Shelter Island Drive #200, San Diego, California 92106, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0960-8528","authenticated-orcid":false,"given":"Dorian S.","family":"Houser","sequence":"additional","affiliation":[{"name":"National Marine Mammal Foundation 1 , 2240 Shelter Island Drive #200, San Diego, California 92106, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Robert F.","family":"Burkard","sequence":"additional","affiliation":[{"name":"Department of Rehabilitation Science, University at Buffalo 3 , 626 Kimball Tower, Buffalo, New York 14214, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"231","published-online":{"date-parts":[[2023,8,9]]},"reference":[{"key":"2023080917054050200_c1","doi-asserted-by":"publisher","first-page":"1530","DOI":"10.1121\/1.428438","article-title":"Auditory brainstem responses with optimized chirp signals compensating basilar-membrane dispersion","volume":"107","year":"2000","journal-title":"J. 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