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. 2017 Jan 5;7:239. doi: 10.3389/fneur.2016.00239

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Copyright © 2017 Ueberfuhr, Wiegrebe, Krause, Gürkov and Drexl.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Audiograms from both ears, spontaneous otoacoustic emissions (SOAEs), and level and frequency estimates of the tinnitus percept after low-frequency (LF) sound exposure for three different normal-hearing participants (A–C). SOAEs were recorded in ipsilateral ears before and immediately after exposure to a 30 Hz tone at 120 dB SPL for 90 s. In all three measures, red color refers to the right ear, blue color refers to the left ear. Light lines indicate audiogram thresholds (gaps within light lines are due to lack of valid data points of audiometric testing), open squares represent five adjustments of level and frequency of the matching tone presented to the contralateral ear. Solid lines represent the spectrum of the SOAE recording. Open circles represent SOAEs before LF sound exposure, filled circles represent SOAEs after LF sound exposure. Gray patches highlight SOAEs and corresponding matching tone adjustments.