Scientists have found a new way to stimulate areas deep inside the brain without permanently placing electrical wires there.
In mice with Parkinson’s-like movement problems, tiny magnetic particles helped improve movement when the animals were exposed to a magnetic field.
The approach could one day offer an alternative to deep brain stimulation, a treatment already used for some people with Parkinson’s disease. However, the new technique is still at an early experimental stage and has so far been tested in animals rather than patients.
Parkinson’s disease develops as brain cells that make dopamine gradually become damaged and die. Dopamine helps brain networks control movement, so its loss can lead to shaking, stiffness, slower movement and problems with balance and walking.
Medicines can help replace or copy some of dopamine’s effects, but they may become less effective or cause unwanted effects after years of treatment. Some people with advanced symptoms are therefore offered deep brain stimulation.
With standard deep brain stimulation, surgeons place thin electrodes into carefully selected areas of the brain. Wires connect the electrodes to a small pulse generator usually placed under the skin near the chest, allowing electrical signals to change abnormal brain activity.
The treatment can greatly improve symptoms in selected patients, but brain surgery is complex and not everyone is suitable for it. Researchers have therefore been searching for ways to reach deep brain circuits with fewer permanently implanted parts.
An international team led by researchers from Friedrich-Alexander-Universität Erlangen-Nürnberg, with scientists from RWTH Aachen University and the Universities of Maastricht and Leuven, tested a different idea. Instead of electrical electrodes, they used specially designed magnetic nanoplatelets.
These extremely small particles were injected directly into the subthalamic nucleus, a region deep in the brain that is also commonly targeted by conventional deep brain stimulation. The particles were designed to turn an outside magnetic field into tiny physical forces.
When a magnetic field was applied around the animals’ heads, the particles responded mechanically. Their movement gently changed nearby cell membranes, somewhat like pressing a finger against the surface of a balloon.
Nerve cells have tiny channels that can respond to physical pressure or stretching. The mechanical forces created by the magnetic particles opened these channels, allowing electrically charged particles to enter the cells and change their activity.
The researchers tested the technique in mice in which dopamine-producing nerve cells had been damaged to create movement difficulties similar to important features of Parkinson’s disease. They placed the particles precisely in the subthalamic nucleus using a carefully controlled injection procedure.
After the mice were exposed to the magnetic field, their movement problems improved significantly. According to the researchers, the size of the improvement was similar to what they would expect from conventional deep brain stimulation in this type of animal experiment.
The team also followed the implanted particles for several months. They reported no signs of inflammation during the testing period, an encouraging early indication that the material was tolerated by the animals.
The researchers are now exploring ways to make the technique even less invasive. One long-term goal would be to deliver the particles through the bloodstream and somehow guide them across the blood-brain barrier, which normally protects the brain from many substances circulating in the body.
Another possibility is a wearable device, such as a headband, that could produce the magnetic field needed for stimulation. Changing the strength or pattern of that field might allow doctors to adjust the treatment without changing an implanted electrical device.
The study was published in 2026 in the peer-reviewed journal Advanced Science. It involved researchers from Friedrich-Alexander-Universität Erlangen-Nürnberg, RWTH Aachen University, Maastricht University in the Netherlands and KU Leuven in Belgium.
The results are promising because they show that magnetic particles can influence a deep brain circuit strongly enough to improve movement in an animal model. The months-long observation without obvious inflammation also provides useful early safety information.
There are important limitations, however. The particles still had to be injected directly into the brain, and success in mice does not show that the method will be safe, precise or effective in people with Parkinson’s disease.
Researchers will need to study long-term effects, particle movement inside the brain, safe magnetic-field settings and whether repeated stimulation remains effective. Human trials are likely years away, but the work offers an unusual new direction for developing less invasive ways to control brain activity.
If you care about Parkinson’s disease, please read studies that Vitamin B may slow down cognitive decline, and Mediterranean diet could help lower risk of Parkinson’s.
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