CFR › Title 21 › Part 882 › §882.131021 CFR §882.1310Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Identification. A cortical electrode is an electrode which is temporarily placed on the surface of the brain for stimulating the brain or recording the brain's electrical activity.(b)Classification. Class II (performance standards).