Transcranial ultrasound stimulation is gaining attention as a non-invasive technique capable of influencing deep brain circuits involved in motivation and reward. A recent study from the University of Plymouth found that a brief, targeted ultrasound pulse directed at the nucleus accumbens changed how people learned from rewards. This finding suggests that transcranial ultrasound stimulation might one day be a practical tool for reshaping brain pathways linked to addiction, depression, and other behavioral health challenges.
The nucleus accumbens is a small region buried deep within the brain. It activates when we encounter something enjoyable and helps us repeat behaviors that lead to positive outcomes. Until now, the only way to reliably influence this area in humans was through deep brain stimulation, a surgical procedure that places electrodes inside the brain. The new research shows that similar learning-related effects can be achieved without incisions or implants.
The science behind transcranial ultrasound stimulation
In the study, 26 volunteers completed four visits to the research center. During one session, researchers designed a personalized brain map to guide their stimulation. On the remaining visits, transcranial ultrasound stimulation was delivered to different brain areas for just over one minute each. About ten minutes later, participants completed tasks inside a scanner while the team recorded their choices and brain activity.
The results were striking. After stimulation to the nucleus accumbens, people learned faster from positive feedback, repeated rewarding actions more often, and made beneficial decisions more quickly. These patterns are important because they represent core elements of healthy reward learning. When this system is disrupted, it can contribute to disorders such as addiction, depression, and certain eating disorders.
The researchers also compared these findings with data from patients receiving deep brain stimulation for treatment-resistant anorexia. While deep brain stimulation often normalizes patterns of reward seeking, the ultrasound approach produced an opposite yet still meaningful excitatory effect. In both cases, the reward system was shifted in measurable ways, highlighting the sensitivity of this deep brain region to different types of modulation.
Why This Matters For Mental Health Treatment
The possibility of adjusting a deep brain circuit using transcranial ultrasound stimulation is a major development for interventional psychiatry. Deep brain structures are usually difficult to reach without surgery, which limits who can benefit from targeted treatments. Ultrasound offers a flexible, non-invasive option that can be customized to each person’s brain anatomy.
Researchers believe this approach may eventually support treatments for conditions that involve disrupted reward processing. These include addiction, depression, anxiety disorders, and anorexia. Because the stimulation can be targeted with precision, clinicians may be able to personalize the treatment to the individual’s brain circuitry rather than relying on a one-size-fits-all method.
Professor Elsa Fouragnan, who led the project, noted that the findings reveal a direct connection between a key learning process and a specific brain region previously accessible only through invasive surgery. This makes the work an important step toward new clinical tools that can gently shift brain function toward healthier patterns.
Where Will The Research Go Next ?
The study represents an early but influential proof of concept. Future work will need to determine how long the effects of transcranial ultrasound stimulation last and whether repeated sessions can create meaningful, lasting improvements in people with mental health disorders. Researchers are also exploring how to refine individualized targeting so that the stimulation can reliably engage the same circuit across different brains.
For now, the results offer an exciting view of what may be possible. A technique lasting just one minute altered reward learning in a measurable way without surgery, discomfort, or medication. As interventional psychiatry continues expanding its toolkit, transcranial ultrasound stimulation may become one of the most promising avenues for reshaping faulty brain circuits safely and effectively.
Citations
- Primary study in Nature Communications
Yaakub SN, Eraifej J, Bault N, et al. Non-invasive ultrasonic neuromodulation of the human nucleus accumbens impacts reward sensitivity. Nature Communications. 2025.
Article link https://www.nature.com/articles/s41467-025-65080-9 Nature+1 - Lay summary / press release from the University of Plymouth
University of Plymouth. Non-invasive technology can shape the brain’s reward-seeking mechanisms. News release, November 27, 2025.
News link: https://www.plymouth.ac.uk/news/non-invasive-technology-can-shape-the-brains-reward-seeking-mechanisms University of Plymouth+1