In case of clear lateralization, the matching sound was presented to the contralateral ear. When it was localized in the middle, the matching sound was presented to the audiometrically better ear. Then the test leader tried to match the nature of the tinnitus: its character (i.e. pure tone, noise, warble, etc.), pitch, and loudness according to the participant’s feedback. Speech reception in noise (SRT) For speech-in-noise testing, we applied a stand-alone version of the telephone test (Smits et al. 2004), installed on a laptop computer. The SRT test uses an adaptive procedure, a simple one-up one-down procedure with a step size of 2 dB. Participants responded to each
set of three spoken digits (triplets) using the laptop Acalabrutinib chemical structure 5-Fluoracil concentration digit-keys. The response was judged to be correct when all three digits were correct. For each SRT measurement a series of 23 triplets is chosen randomly out of 80 triplets: the SRT was then calculated by averaging the signal-to-noise ratios of the last 20 presentation levels (i.e. the last presentation level is based on the last response). Otoacoustic emissions (OAEs) Both transient evoked otoacoustic emissions (TEOAE) and distortion product otoacoustic emissions (DPOAE) were measured
on both ears of each musician using Otodynamics ILO 292 equipment. Each test day the probe was calibrated before OAE-measurement. TEOAE’s were evoked using a 80 dBpeSPL click stimulus. They were measured in the Phenylethanolamine N-methyltransferase non-linear mode and filtered in half-octave frequency bands at 1, 1.5, 2, 3 and 4 kHz. DPOAE were evoked using pairs of tones f 1 and f 2 with particular intensity and
frequency relations (f 1:f 2 ratio). The evoked response from these stimuli occurs at a third frequency, the distortion product frequency f dp, which is calculated as f dp = 2 × f 1−f 2. The DPOAEs levels of the primary tones, L 1 and L 2, were 75 and 70 dB SPL, respectively. The frequency ratio of f 2/f 1 was 1.22. DPOAEs were measured at the frequency 2f 1−f 2 for 27 f 2 frequencies ranging from 815 to 8,000 Hz (i.e. 8 points per octave). The emission level was established on the basis of three presentations. In case of high noise floors, the measurement was repeated manually at particular frequencies, usually below 2 kHz. Questionnaire All participants completed a self-report questionnaire that consisted of the relevant questions related to ear and hearing problems in the medical history, questions about behaviour towards loud music and noise, questions about personal hearing complaints, the use of hearing protection, and subjective judgments of own hearing capacity. Statistical analyses All statistical analyses were performed using SPSS 12.01. Part of the data has been obtained per ear (i.e. pure-tone thresholds, OAE-responses). In that case, some detailed analyses were performed per ear. However, the majority of results were considered per participant.
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