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Contamination due to the middle ear muscle reflex was avoided by monitoring the magnitude and phase of a probe in the test ear and by monitoring DPOAE stimulus levels throughout testing. Results show modulations in both level and frequency of DPOAE fine structure patterns. Frequency shifts observed at DPOAE level minima could explain reports of enhancement in DPOAE level due to efferent activation. CAS affected the magnitude and phase of the DPOAE component from the characteristic frequency region to a greater extent than the component from the overlap region between the stimulus tones. This differential effect explains the occasional enhancement observed in DPOAE level as well as the frequency shift in fine structure patterns.<\/jats:p>","DOI":"10.1121\/1.3224716","type":"journal-article","created":{"date-parts":[[2009,12,3]],"date-time":"2009-12-03T14:11:54Z","timestamp":1259849514000},"page":"2413-2424","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":50,"title":["Contralateral acoustic stimulation alters the magnitude and phase of distortion product otoacoustic emissions"],"prefix":"10.1121","volume":"126","author":[{"given":"Ryan","family":"Deeter","sequence":"first","affiliation":[{"name":"Northwestern University Roxelyn and Richard Pepper Department of Communication Sciences and Disorders, , Evanston, Illinois 60208"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rebekah","family":"Abel","sequence":"additional","affiliation":[{"name":"Northwestern University Roxelyn and Richard Pepper Department of Communication Sciences and Disorders, , Evanston, Illinois 60208"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lauren","family":"Calandruccio","sequence":"additional","affiliation":[{"name":"Northwestern University Roxelyn and Richard Pepper Department of Communication Sciences and Disorders, , Evanston, Illinois 60208; Hugh Knowles Center for Hearing Research, , Evanston, Illinois 60208; and Department of Linguistics, , Evanston, Illinois 60208"},{"name":"Northwestern University Roxelyn and Richard Pepper Department of Communication Sciences and Disorders, , Evanston, Illinois 60208; Hugh Knowles Center for Hearing Research, , Evanston, Illinois 60208; and Department of Linguistics, , Evanston, Illinois 60208"},{"name":"Northwestern University Roxelyn and Richard Pepper Department of Communication Sciences and Disorders, , Evanston, Illinois 60208; Hugh Knowles Center for Hearing Research, , Evanston, Illinois 60208; and Department of Linguistics, , Evanston, Illinois 60208"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sumitrajit","family":"Dhar","sequence":"additional","affiliation":[{"name":"Northwestern University Roxelyn and Richard Pepper Department of Communication Sciences and Disorders, , Evanston, Illinois 60208 and Hugh Knowles Center for Hearing Research, , Evanston, Illinois 60208"},{"name":"Northwestern University Roxelyn and Richard Pepper Department of Communication Sciences and Disorders, , Evanston, Illinois 60208 and Hugh Knowles Center for Hearing Research, , Evanston, Illinois 60208"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"231","published-online":{"date-parts":[[2009,11,5]]},"reference":[{"key":"2023073021452046800_c1","doi-asserted-by":"publisher","first-page":"1584","DOI":"10.1121\/1.3068442","article-title":"Considering distortion product otoacoustic emission fine structure in measurements of the medial olivocochlear reflex","volume":"125","year":"2009","journal-title":"J. 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