Deep Brain Stimulation May Treat Tinnitus

A novel brain stimulation technique, aimed at the core of the brain’s reward system, has successfully reduced tinnitus in animal research. The study, led by Yiwen Zheng, Renelyn Sistoza Parra, and Jonny Park, demonstrates that directly modifying activity in the salience network can “recondition” the brain to ignore the phantom sound. The work was published with the DOI 10.1038/s41598-026-49513-z.

**Targeting the Brain’s Salience Network for Tinnitus**

Many persistent neurological conditions, including tinnitus, misophonia, and some forms of hyperacusis, are thought to stem from maladaptive learning. The brain learns, incorrectly, to assign extreme importance or threat to certain signals. A central player in this process is the salience network, a system that determines what stimuli are rewarding, threatening, or worth paying attention to.

The researchers hypothesized that the ventral striatum, particularly the nucleus accumbens, acts as a physiological core for this network. In tinnitus, the brain may have learned to treat the phantom frequency as highly salient—a signal that demands attention and causes distress. The team asked if they could directly reverse this learned salience by manipulating the nucleus accumbens.

**Rewarding the Brain to Ignore Tinnitus**

The team used a validated rat model of tinnitus. They then implanted tiny electrodes to stimulate specific brain regions. The central experiment involved playing a non-tinnitus tone to the animals while simultaneously delivering a brief, rewarding electrical pulse to the nucleus accumbens. This pairing was designed to teach the brain that the external tone was positive and safe, theoretically reducing the relative salience of the internal tinnitus sound.

A second, more complex approach was also tested. Here, the rewarding nucleus accumbens stimulation was paired with non-tinnitus tones, while a separate “dysrewarding” (negative) stimulation was delivered to the lateral habenula—a region involved in disappointment and aversion—when a tinnitus-frequency tone was played. This attempted to actively punish the brain for paying attention to the tinnitus signal.

**Bilateral Rewarding Stimulation Emerges as Most Effective**

The results were clear. The bilateral rewarding stimulation of the nucleus accumbens, paired with non-tinnitus tones, was the most effective method for suppressing tinnitus perception in the model. It reduced the behavioral signs of tinnitus without apparent negative side effects.

The combined approach—using both reward and “dysreward”—also suppressed tinnitus. However, it caused significant negative effects, including indications of anhedonia, a reduced ability to feel pleasure. This suggests that while targeting negative valence can work, it carries a substantial risk of worsening mood, a common co-occurrence in people with chronic tinnitus.

The study authors conclude that the rewarding stimulation alone can recondition brain networks to remove the salience of tinnitus frequencies. “Our results demonstrate how the rewarding stimulation can recondition brain networks to effectively remove the salience of tinnitus frequencies,” they wrote. This work aligns with other research exploring how tinnitus alters broader brain activity and blood flow.

**Implications for Human Tinnitus and Related Disorders**

This research provides a strong proof-of-concept that directly targeting the brain’s salience circuitry can modify a condition rooted in maladaptive learning. For human tinnitus, it points toward potential future neuromodulation therapies that are more targeted than current non-invasive methods like transcranial direct current stimulation (tDCS).

The implications extend beyond tinnitus. Conditions like misophonia, where specific sounds trigger intense emotional and physiological responses, are also believed to involve faulty salience assignment and limbic system engagement. A previous fMRI study on misophonia and hyperacusis highlighted distinct brain response patterns, underscoring the role of non-auditory networks. The reconditioning strategy demonstrated here could inform therapeutic approaches for these disorders as well.

Practically, this study reinforces the importance of the brain’s learned associations in maintaining chronic tinnitus. It supports behavioral approaches that focus on reducing the threat value of tinnitus and increasing engagement with positive, external sounds. While invasive brain stimulation is not a current treatment, the principles of positive reinforcement and salience retraining are accessible through sound therapy and cognitive behavioral interventions.

The authors anticipate their reconditioning strategy has broader therapeutic applications for other brain disorders rooted in similar learning processes. The next steps will involve translating this approach to safe, non-invasive or minimally invasive technologies for human trials, moving from silencing tinnitus in rats to reducing suffering in patients.