Interfacing with the brain for therapy

Deep brain stimulators for Parkinson’s disease and essential tremor currently deliver a constant electrical pulse, regardless of what the brain is doing at that moment. This programme will develop feedback-controlled systems that adjust stimulation in real time based on the state of neural circuits. The problem is that drugs cannot keep up with the rapid, moment-to-moment interactions between nerve cells that drive brain dysfunction. Electrical stimulation can intervene fast enough, but today’s devices lack the ability to titrate the dose to the brain’s changing needs. That fixed approach limits effectiveness and can cause side effects. If this succeeds, patients with Parkinson’s disease and essential tremor could receive therapy that adapts on the fly—boosting stimulation when symptoms worsen and reducing it when the brain is stable. That could mean fewer side effects and better symptom control throughout the day. The same feedback principle could eventually extend to other brain disorders where neural dynamics shift rapidly, such as epilepsy or depression. The work also covers non-invasive stimulation via electrodes on the scalp or limbs, widening the range of patients who could benefit.