Transcranial Pulse Stimulation (TPS) Simply Explained

1. What It Is About

Transcranial Pulse Stimulation, or TPS for short, is a procedure in which the brain is stimulated from the outside with sound waves. A handheld device is placed on the scalp and emits short, very fine ultrasound pulses. These pulses are focused so that they reach a specific location in the brain through the skull. There, they can influence the activity of nerve cells. The procedure is one of the non-invasive methods: the skin is not injured, there is no surgery. TPS was developed from ultrasound research, where sound waves have long been used for examining and measuring. Later it was discovered that nerve cells in the brain can also be stimulated with it. How strong and how long the effect lasts depends on how the pulses are set and which brain region is treated. Therefore, different frequencies, pulse types and intensities are used in the studies.

2. What Studies Show

The effects on movement and cognitive performance have been studied most thoroughly so far. In a study with 20 healthy people, finger mobility improved after treatment and nerve signals from the head to the muscles became stronger 7. Another study with 14 healthy people showed that the excitability of the motor centre in the brain remained elevated for up to 30 minutes 1. In 21 healthy participants, a specific low pulse frequency led to a longer-lasting reduction in nerve signals 2. In people with depression, a study with 30 adults measured fewer depressive symptoms after six sessions over two weeks, and the effect was still visible after three months 3. Another study with 60 people with Alzheimer’s disease found better scores in a memory and cognition test after treatment, also with effects lasting up to three months 4. In 19 older people with mild memory problems, attention and thinking tasks improved after six sessions over two weeks 5. A small study with 14 people with Parkinson’s disease reported better movement and cognition scores after twelve sessions over four weeks 8. In a study with 30 adolescents with ADHD, fewer symptoms were reported and no serious side effects occurred 6.

3. What Remains Unclear

Many of these studies were small and lacked a comparison group receiving sham treatment. It is therefore not possible to say with certainty how much of the improvement is truly due to the treatment. The studies also used different settings, different brain regions and different test procedures. This makes it difficult to compare the results directly. Little is known about the long-term effect either: most studies followed participants for only a few weeks up to three months. Regarding safety, a review of transcranial ultrasound stimulation with 677 participants found no serious side effects; mild complaints such as headaches or skin irritation occurred in 3.4 percent 9. Whether rare risks arise with repeated use over long periods has not yet been clarified. One feature complicates research: because the treatment is barely noticeable, participants often do not know whether they are receiving the real or a sham treatment.

4. What This Means in Everyday Life

TPS is a young procedure. Safety has been well described in the settings studied, and there were indications of improvements in depression, Alzheimer’s disease, Parkinson’s disease and ADHD. These indications are not yet confirmed, however, because larger and better comparable studies are lacking. Anyone seeking information about TPS should know that research is still at an early stage and many questions remain open. The most important next steps are larger studies with comparison groups, longer observation periods and standardised treatment protocols. Only then can it be determined for which complaints and for whom the procedure is truly suitable.

All Details with Study Numbers and Sources: detailed page on Transcranial Pulse Stimulation (TPS). For Children: Transcranial Pulse Stimulation (TPS) for Children.