Transcranial direct current stimulation intensity and duration effects on tinnitus suppression

Area of Science:

• Neuroscience
• Audiology
• Medical Devices

Background:

• Tinnitus, the perception of sound without an external source, significantly impacts quality of life.
• Anodal transcranial direct current stimulation (tDCS) applied to the left temporoparietal area (LTA) is being investigated for tinnitus management.

Purpose of the Study:

• To evaluate the effectiveness of tDCS for tinnitus suppression.
• To determine the optimal dose parameters (current intensity and duration) for tDCS in treating tinnitus.

Main Methods:

• A pilot study involving 25 participants with chronic tinnitus (mean age 54).
• Anodal tDCS was applied to the LTA, varying current intensity (1 mA, 2 mA) and duration (10, 15, 20 minutes).
• The impact of different tDCS parameters on tinnitus loudness and global improvement was measured.

Main Results:

• tDCS was well-tolerated by all participants.
• Transient tinnitus suppression was observed in 56% of participants.
• Long-term symptom improvement, including reduced annoyance and better sleep, was reported by 44% of participants.
• A significant interaction between stimulation duration and intensity was found for changes in tinnitus loudness and clinical global improvement.

Conclusions:

• Anodal tDCS of the LTA with 2 mA current intensity for 20 minutes appears to be the most effective parameter.
• tDCS shows potential as a clinical tool for tinnitus reduction.
• Further long-term clinical trials are necessary to confirm these findings.