Thalamus Seizure Detection With a Deep Brain Stimulator System

Inclusion Criteria: Participants must meet all of the inclusion criteria to participate in this study: * 18 years of age and older. * Implanted with a clinical DBS system for epilepsy with brain recording capabilities (Medtronic Percept™ DBS). * Subject or legally authorized representative is able to understand study procedures and to comply with them for the entire length of the study. Exclusion Criteria: All candidates meeting any of the exclusion criteria at baseline will be excluded from study participation: * Health status or any clinical conditions (e.g., life expectancy, co-existing disease) that, in the opinion of the site investigator, would pose undue risk to undergo epilepsy monitoring unit evaluation for the purpose of seizure characterization. * Women will verify not pregnant, and if applicable, have urine pregnancy test. * Current drug or alcohol use or dependence that, in the opinion of the site investigator, would interfere with adherence to study requirements. * Inability or unwillingness of individual or legal guardian/representative to give written informed consent.