Tinnitus patients were matched to controls with normal hearing up to 8 kHz

Evidence

Subjects were recruited from the hospital’s tinnitus outpatient clinic as well as from advertisements in local media. None of them had a history of neurological or psychiatric disorders. Subjects’ characteristics are listed in Table 1 (Langers et al. 2012 ). Except for the presence of tinnitus in the patient group, all subjects were selected to have normal or near-normal hearing up to 8 kHz. Thresholds were determined in a frequency range of 0.25–16 kHz by means of pure-tone audiometry. Subjects also performed the adaptive categorical loudness scaling (ACALOS) procedure (Brand and Hohmann 2002 ). — Dijk, Pim van, Physiology, Psychoacoustics and…, 2709