Researchers have developed a novel closed-loop electrical stimulation system that interrupts focal epilepsy seizures while preserving long-term memory, as detailed in Nature Neuroscience. Unlike open-loop systems, this technology delivers precisely timed pulses based on real-time neural feedback, preventing seizure progression and neural circuit damage. This breakthrough addresses both seizure control and the cognitive decline historically associated with drug-resistant focal epilepsy, offering a new therapeutic pathway for millions worldwide.