The Responsive Neuro System (RNS®) is the first and only brain-responsive neurostimulation system designed to prevent epileptic seizures at their source. The RNS neurostimulator is a small, implantable device connected to wires (or leads) that are placed in up to two seizure onset areas. The device continuously monitors brain activity, detects abnormal patterns, and in response delivers imperceptible electrical pulses to normalize the activity before an individual experiences seizures.