Key Takeaways
- A new ultrasound device can modulate brain activity more precisely than previous methods, targeting deep brain regions non-invasively.
- Clinical applications may include treatments for neurological disorders such as Parkinson’s disease and depression.
- The technology represents a shift in neuroscience, offering safe and repeatable methods for understanding brain function and developing therapies.
Advancements in Non-Invasive Brain Modulation
Scientists have been exploring ways to modulate brain function non-invasively to enhance understanding of brain mechanisms and develop treatments for neurological diseases. A promising technology in this area is transcranial ultrasound stimulation (TUS). Recent advancements reveal a new TUS device capable of influencing deeper brain regions with precision previously unattainable.
Conventional TUS systems often affect large areas of the brain, hindering targeted neuromodulation. However, the new device detailed in a study published in Nature Communications introduces a system that can pinpoint areas around 1,000 times smaller than typical ultrasound devices. It utilizes 256 elements arranged in a specialized helmet to focus ultrasound beams precisely on specific brain structures, aided by a soft mask that stabilizes the head during treatment.
To demonstrate the device’s capabilities, researchers conducted experiments involving seven human volunteers. They focused on the lateral geniculate nucleus (LGN) in the thalamus, which relays sensory and motor information. In the first experiment, participants viewed a flashing checkerboard, and fMRI scans indicated substantial activity increases in their visual cortex during ultrasound stimulation, confirming accurate targeting.
Further experiments showed that visual cortex activity remained decreased for up to 40 minutes after stimulation, suggesting potential for lasting brain changes. Although participants did not consciously perceive differences, brain scans demonstrated significant alterations in neural activity. The overarching intention is to leverage these effects for clinical benefits, including alleviating symptoms like hand tremors.
Professor Bradley Treeby from UCL Medical Physics and Biomedical Engineering highlighted the implications for neuroscience research and clinical treatment. The technology allows for non-invasive exploration of deep brain circuits that were previously studied only through surgery. It holds promise for treating neurological and psychiatric disorders like Parkinson’s and depression with exceptional precision.
Unlike deep brain stimulation (DBS), which requires invasive surgical procedures, this ultrasound system provides a non-invasive alternative. It can assist clinicians in testing brain regions for potential disease treatments before considering surgery, or even replacing surgical methods altogether.
Dr. Ioana Grigoras from the University of Oxford expressed excitement about the clinical applications this technology may have, particularly for conditions where deep brain regions are critical. Recognizing its potential, members of the research team have established NeuroHarmonics, a spinout company focused on developing a portable, wearable version of the system for broader access to non-invasive deep brain therapy.
The system is designed to be compatible with real-time fMRI monitoring, enabling possibilities for personalized therapies through closed-loop neuromodulation. While further studies are required to fully elucidate the mechanisms driving TUS-induced neuromodulation, these findings mark a significant milestone in the evolution of safe and effective brain stimulation technologies.
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