A new study explores how deep brain stimulation may help improve speech and swallowing in people with brain injuries.
Speech and swallowing rely on the brain coordinating many muscles at the right time. After a traumatic brain injury (TBI), damage to the brain’s movement pathways can make these everyday activities more difficult.
Some people may have trouble speaking clearly or controlling the muscles involved in swallowing. These difficulties can affect communication, eating, drinking, and quality of life.
A new study published in Nature Communications explores whether adjusting deep brain stimulation could help improve these challenges.
What is deep brain stimulation?
Deep brain stimulation (DBS) is a treatment that uses electrical signals to influence activity in specific areas of the brain. It involves placing electrodes in the brain and connecting them to a device that delivers electrical stimulation.
DBS is already used to treat certain neurological conditions. Researchers are also exploring whether it could help people with brain injuries that affect movement, speech, and other functions.
In this study, researchers investigated stimulation of an area of the brain called the motor thalamus, which helps support movement.
What did the researchers find?
The researchers examined how different stimulation settings affected movements involved in speech and swallowing. They first studied eight participants without brain injuries to better understand how stimulation affected these movements. They then tested the approach in one person with a traumatic brain injury.
The results suggested that lower-frequency stimulation may help improve speech and swallowing.
In the participant with TBI, lower-frequency stimulation helped improve several measures of speech clarity and swallowing. Higher-frequency stimulation did not provide the same benefits and sometimes produced less favourable results.
These findings suggest that the settings used for brain stimulation may be important. Rather than using the same settings for every purpose, researchers may be able to adjust stimulation to better support specific functions.
Why does this research matter?
Difficulties with speech and swallowing can create significant challenges for people recovering from a brain injury. Speech difficulties can make it harder to communicate with others, while swallowing difficulties can affect eating and drinking and may create additional health risks.
Treatments that help improve these functions could support greater independence and quality of life.
This study offers an early look at how DBS might one day help address some of these challenges. It also highlights the importance of understanding how different stimulation settings affect different movements.
What happens next?
Although the findings are promising, more research is needed before this approach can be considered a treatment option for people with TBI.
The study included only one participant with a brain injury for its functional testing. Larger studies will be needed to determine whether the benefits can be reproduced in other people, how long they might last, and who could benefit most.
DBS also involves brain surgery, so its potential benefits and risks must be carefully evaluated.
For now, this research provides an encouraging starting point for exploring new ways to support speech and swallowing after brain injury.
References
Tang, L.W., Grigsby, E.M., Damiani, A. et al. Frequency-dependent effects of motor thalamus deep brain stimulation on speech and swallowing. Nat Commun 17, 8794 (2026). https://doi.org/10.1038/s41467-026-75588-3
