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When elicited by contralateral acoustic stimulation (CAS), these reflexes reduce cochlear amplification (MOC reflex) and limit low-frequency transmission through the middle ear (MEM reflex). The independent roles of these reflexes on auditory physiology and perception are difficult to distinguish. The amplitude of the cochlear microphonic (CM) is expected to increase or decrease when the MOC and MEM reflexes are elicited by CAS, respectively, which could lead to a straightforward interpretation of what reflex is dominant for a given CAS level. CM and ear canal sound pressure level (SPL) were measured for a 500\u2009Hz, 90 dB SPL probe in the presence of contralateral broadband noise (CBBN) for levels ranging from 45\u201375\u2009dB SPL. In most subjects, CM amplitude increased for CBBN levels of 45 and 55 dB SPL, while no change in ear canal SPL was observed, consistent with eliciting the MOC reflex. Conversely, CM amplitude decreased, and ear canal SPL increased in the presence of 65 and 75 dB SPL CBBN, consistent with eliciting the MEM reflex. A CM-based test of the MOC reflex may facilitate detection of MEM effects and the assessment of adults with cochlear hearing loss.<\/jats:p>","DOI":"10.1121\/10.0017604","type":"journal-article","created":{"date-parts":[[2023,3,15]],"date-time":"2023-03-15T11:57:56Z","timestamp":1678881476000},"page":"1723-1732","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":11,"title":["Middle ear muscle and medial olivocochlear activity inferred from individual human ears via cochlear potentials"],"prefix":"10.1121","volume":"153","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7750-8396","authenticated-orcid":false,"given":"Skyler G.","family":"Jennings","sequence":"first","affiliation":[{"name":"Department of Communication Sciences and Disorders, The University of Utah , 390 South, 1530 East, BEHS 1201, Salt Lake City, Utah 84112, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Elizabeth Sarai","family":"Aviles","sequence":"additional","affiliation":[{"name":"Department of Communication Sciences and Disorders, The University of Utah , 390 South, 1530 East, BEHS 1201, Salt Lake City, Utah 84112, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"231","published-online":{"date-parts":[[2023,3,15]]},"reference":[{"key":"2023081104160509600_c1","doi-asserted-by":"publisher","first-page":"403","DOI":"10.1007\/s10162-012-0319-2","article-title":"Maturation and aging of the human cochlea: A view through the DPOAE looking glass","volume":"13","year":"2012","journal-title":"J. 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