Does it matter what is trained? A randomized controlled trial evaluating the specificity of alpha/delta ratio neurofeedback in reducing tinnitus symptoms.

Insomnia severity, measured with the ISI, showed a significant main effect of time at post-intervention (T 3 ) and an effect trending towards significance at follow-up (T 4 ) for the MTI group (T 3 , estimate: −1.93, SE: 0.72, P = 0.008; T 4 , estimate: −1.47, SE: 0.77, P = 0.06) in the ITT analysis.

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For hypothesis 2, results did show significant interactions: at follow-up (T 4 ), BTR-NF participants showed marginally significant improvement compared to MTI (BTR-NF: estimate: −8.14, SE: 4.10, P = 0.048).

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That is, both BTR-NF and MTI reported highly significant benefit of the interventions over time, in terms of tinnitus distress reduction.

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