title: Wideband detection of middle ear muscle activation using swept-tone distortion product otoacoustic emissions.
abstract: The measurement of efferent-induced suppression of otoacoustic emissions (OAEs) using contralateral acoustic stimulation (CAS) is complicated by potential contamination by the middle ear muscle reflex (MEMR), particularly at moderate to high CAS levels. When logarithmically sweeping primaries are used to measure distortion product otoacoustic emissions, the level and phase of the primaries at the entrance of the ear canal may be monitored simultaneously along with the OAEs elicited by the swept-tones. A method of detecting MEMR activation using swept-tones is presented in which the differences in the primaries in the ear canal with and without CAS are examined, permitting evaluation of MEMR effects over a broad frequency range. A range of CAS levels above and below expected contralateral acoustic reflex thresholds permitted evaluation of conditions with and without MEMR activation.
authors.affiliation: Speech, Language and Hearing Sciences, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016.
authors.forename: Simon
authors.initials: S
authors.lastname: Henin
authors.affiliation: Speech, Language and Hearing Sciences, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016.
authors.forename: Glenis R
authors.initials: GR
authors.lastname: Long
authors.affiliation: Speech, Language and Hearing Sciences, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016.
authors.forename: Suzanne
authors.initials: S
authors.lastname: Thompson
mesh_terms: D000161:Acoustic Stimulation; D000162:Acoustics; D001309:Auditory Threshold; D006801:Humans; D009119:Muscle Contraction; D017084:Otoacoustic Emissions, Spontaneous; D012022:Reflex, Acoustic; D012815:Signal Processing, Computer-Assisted; D013018:Sound Spectrography; D013719:Tensor Tympani / Q000294:innervation*; D013997:Time Factors