Using ultrasound to stimulate a specific part of the brain could offer a non-invasive therapy that benefits those experiencing chronic pain, a new study has suggested.
The research, published in the journal Nature Communications, was conducted by experts from the University of Plymouth’s Brain Research and Imaging Centre and the University of Exeter Medical School.
They invited participants to sessions where transcranial ultrasound stimulation (TUS) – a safe low-intensity and targeted neuromodulation technique – was applied to the dorsal anterior cingulate cortex (dACC), a region of the brain implicated in those experiencing chronic pain.
During the stimulation, their right hand was placed in a cold gel to illicit pain sensations and they were asked a series of questions to rate the severity of any pain they were feeling.
They also underwent MRI and magnetic resonance spectroscopy (MRS) scans throughout the same period, which researchers used to monitor any functional and biochemical changes within the participants’ brain.
The results showed that while TUS had no immediate effect on the pain intensity people were feeling, they reported a significantly greater reduction in pain from 28 to 55 minutes after the TUS application, suggesting it may have a delayed analgesic effect.
The researchers say the study extends current understanding of the effects of TUS on the dorsal anterior cingulate cortex by demonstrating it can bring about functionally meaningful changes in pain perception and brain connectivity.
The also believe the findings lay important groundwork for exploring the therapeutic use of TUS in people experiencing chronic pain through conditions including fibromyalgia, back pain and arthritis, or while they are recovering after cancer treatment.
Dr Sophie Clarke, Post Doctoral Research Fellow at the University of Plymouth and the study’s lead author, said: “The study aimed to characterise how transcranial ultrasound stimulation interacts with – and potentially also alters – the brain’s processing of pain. Understanding these mechanisms will be very important to support the next steps in understanding whether the stimulation can be effective in helping patients with chronic pain.”
The University of Plymouth, through its Brain Research Imaging Centre (BRIC) and Centre for Therapeutic Ultrasound (CENTUS), is recognised globally for its brain stimulation research.
It is the UK’s leading TUS research centre, and its academics have conducted extensive research into the benefits of brain stimulation for conditions including anxiety and depression, addiction and other neurological or psychiatric disorders.
