caa a22 4500 477087183 CHVBK 20180405111506.0 cr unu---uuuuu 170330e19960101xx s 000 0 eng 10.1007/BF00615115 doi (NATIONALLICENCE)springer-10.1007/BF00615115 Limitations in the use of distortion product otoacoustic emissions in objective audiometry as the result of fine structure [Elektronische Daten] [J. Heitmann, B. Waldmann, P. Plinkert] There is strong evidence for a link between intact cochlear function and otoacoustic emissions (OAE). However, all attempts to find a close correlation between auditory thresholds and amplitudes of distortion product otoacoustic emissions (DPOAE) have failed. As an explanation for these findings, we have studied DPOAE fine structure and its dependence on increasing primary sound levels. Errors due to different calibrations of equipment for measuring DPOAE and auditory thresholds were also investigated. DPOAE were measured in 16 subjects using a frequency range of 500-1000 Hz. Frequencies were changed in 12.5 Hz steps at primary levels of 55, 60, 65 and 70 dB SPL. DPOAE amplitudes were found to vary by up to 20 dB for a frequency step of 50 Hz. Some fine structures showed narrow dips that shifted in frequency and diminished in amplitude with increasing primary levels. These findings demonstrated that sampling DPOAE amplitudes at widely spaced frequencies gave incomplete information about true course. DPOAE growth functions measured close to a dip in the DPOAE fine structure were rendered useless by interference with either the frequency shift or amplitude variations of the dip at different primary levels. Springer-Verlag, 1996 Audiometry nationallicence Distortion product otoacoustic emissions nationallicence Cochlear amplifier nationallicence Heitmann J. Universität Tubingen, Lehrstuhl fur Tierphysiologie, Auf der Morgenstelle 28, D-72076, Tubingen, Germany aut Waldmann B. Universität Tubingen, Lehrstuhl fur Tierphysiologie, Auf der Morgenstelle 28, D-72076, Tubingen, Germany aut Plinkert P. HNO-Klinik, Universität Tubingen, Tubingen, Germany aut European Archives of Oto-Rhino-Laryngology Springer-Verlag 253/3(1996-01-01), 167-171 0937-4477 253:3<167 1996 253 405 https://doi.org/10.1007/BF00615115 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00615115 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Heitmann J. Universität Tubingen, Lehrstuhl fur Tierphysiologie, Auf der Morgenstelle 28, D-72076, Tubingen, Germany aut NATIONALLICENCE 700 1- Waldmann B. Universität Tubingen, Lehrstuhl fur Tierphysiologie, Auf der Morgenstelle 28, D-72076, Tubingen, Germany aut NATIONALLICENCE 700 1- Plinkert P. HNO-Klinik, Universität Tubingen, Tubingen, Germany aut NATIONALLICENCE 773 0- European Archives of Oto-Rhino-Laryngology Springer-Verlag 253/3(1996-01-01), 167-171 0937-4477 253:3<167 1996 253 405 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer