Reconciling the origin of the transient evoked ototacoustic emission in humans

Robert H. Withnell, Chantel Hazlewood, Amber Knowlton
2008 Journal of the Acoustical Society of America  
A pervasive theme in the literature for the transient evoked otoacoustic emission ͑TEOAE͒ measured from the human ear canal has been one of the emission arising solely ͑or largely͒ from a single, place-fixed mechanism. Here TEOAEs are reported measured in the absence of significant stimulus contamination at stimulus onset, providing for the identification of a TEOAE response beginning within the time window that is typically removed by windowing. Contrary to previous studies, it was found that
more » ... it was found that in humans, as has previously been found in guinea pig, the TEOAE appears to arise from two generation mechanisms, the relative contributions of these two mechanisms being time and stimulus-level dependent. The method of windowing the earliest part of the ear canal measurement to remove stimulus artifact removes part of the TEOAE i.e., much of the component arising from a nonlinear generation mechanism. This reconciliation of TEOAE origin is consistent with all OAEs in mammals arising in a stimulus-level dependent manner from two mechanisms of generation, one linear, one nonlinear, as suggested by Shera and Guinan ͓J. Acoust. Soc. Am. 105, 782-798 ͑1999͔͒.
doi:10.1121/1.2804635 pmid:18177152 fatcat:32rlgzul4fbvzg3xrjbyahrmx4