Bimodal Electrical-Sound Stimulation and Auditory Training for Chronic Tonal Tinnitus
Trial Parameters
Brief Summary
This study tests whether pairing non-invasive stimulation of the greater occipital nerve (NITESGON) with an attentionally demanding auditory frequency discrimination training task reduces tinnitus loudness and tinnitus-related distress. One hundred adults with chronic tonal tinnitus will be randomised to one of four groups in a 2×2 factorial design: real versus sham NITESGON and active versus passive listening during auditory stimulation. Participants complete eight sessions across four weeks, with outcomes assessed at baseline, end of treatment, 28 days post-treatment, and 6 months post-treatment.
Eligibility Criteria
Inclusion Criteria: * Adults aged 18-80 years * Continuous subjective tinnitus for \>3 months and ≤5 years * Predominantly tonal tinnitus (unilateral or bilateral) * Screening THI score 28-76 * Minimum Masking Level (MML) 20-80 dB HL * No prior tinnitus neuromodulation treatment * Able to comply with eight sessions over four weeks and follow-up assessments Exclusion Criteria: * Objective tinnitus or predominantly somatic tinnitus * Pulsatile tinnitus * Evidence of conductive hearing loss (abnormal otoscopy or tympanometry) * Pure-tone audiometry exclusions: \>40 dB HL at any frequency 250 Hz-1 kHz OR \>80 dB HL at any frequency 2-8 kHz in either ear * Hearing aid use initiated within the past 90 days * Active implantable medical device (e.g., pacemaker, DBS, cochlear implant) * LDL \<30 dB SL at 500 Hz in either ear * Diagnosis of temporomandibular joint disorder or occipital neuralgia * Severe anxiety (STAI \>120/160) * Cognitive impairment (MMSE \<25) * Severe depressive symptoms (BD