For example, the regions related to TEOAE frequencies 80 dB SPL) do not fully saturate the cochlea. The TEOAEs are of non-linear origin due to the nonlinear operation of the cochlear amplifier and mainly of the outer hair cells of the organ of Corti ( Kim, 1986 Zwicker, 1986 Leeuw and Dreschler 1998 Thorton et al, 2001 Zinn et al, 2001), but not all segments of the cochlear amplifier saturate at the same stimulus intensity ( Patuzzi, 1987 Shera and Guinnan, 1999). This statement is not true because the utilized clicks are linear (2) the non-linear protocol” assures the capture of the non-linear TEOAE responses, because the high intensity click stimuli the clicks stimulate saturate the cochlea. (1986, 1990), two questionable assumptions have been generated: (1) the non-linear protocol captures the non-linear cochlear responses due to the non-linearity of its stimulation paradigm. Over the years, after the introduction of this methodology by Kemp et al.
The fact that the non-linear protocol contains the words “non-linear” has created considerable confusion in the OAE clinical community. how much the induced linear artifacts at stimulus levels > 80 dB SPL are suppressed ), it is generally accepted that the nonlinear ILO protocol is a practical compromise to maximize the reliability of a TEOAE recording, and this protocol is used to assess of the integrity of the cochlear function of neonatal and adult subjects. Despite the lack of sufficient research on the statistical verification of the functional premises of the nonlinear protocol (i.e. Under the hypothesis that the TEOAE recordings originate from saturated cochlear generators, it is assumed that the nonlinear protocol removes stimulus artifacts of linear nature which can be misinterpreted as TEOAE responses ( Kemp et al, 1986 1990).
Traditionally the transient Evoked Otoacoustic Emission (TEOAE) responses can be evoked by two types of train stimuli: (a) by a set of four clicks of equal magnitude (referred to as the linear protocol) or (b) by three clicks of positive polarity followed by a fourth click of an inverse polarity with a relative magnitude of 9.5 dB higher than the corresponding positive clicks (referred to as the non-linear or the derived non-linear protocol). of Mathematical sciences, Worcester Polytechnic, Worcester, Mass., USAģ Dept of Otolaryngology and Biocommunication, Louisiana State University, New Orleans, LA, USA of Audiology, University of Ferrara, Italy.Ģ Dept. Stavros Hatzopoulos S., Joe Petrucelli J 2., Thierry Morlet T 3. Data from adult subjects (paper summary from )Ī reprint of the original article can be downloaded from here
0 kommentar(er)
