and P PO – between P and O Also, the MCN system renames four electrodes of the 10–20 system: T3 is now T7 T4 is now T8 T5 is now P7 T6 is now P8 A higher-resolution nomenclature has been suggested and called the "5% system" or the "10–5 system". References Bibliography G.E. Chatrian, E. Lettich, and P.L. Nelson. Ten percent electrode system for topographic studies of spontaneous and evoked EEG activity. Am J EEG Technol, 25:83-92, 1985. Ernst Niedermeyer, Fernando Lopes da Silva, Electroencephalography: Basic Principles, Clinical Applications, and Related Fields - Page 140, Lippincott Williams & Wilkins, 2004 , . External links SVG drawing of the 10-20 system (numbering seen as a subset of the 10% division) (PDF) 10-20 System (numbering seen as a subset of the 10% division) Electroencephalography Electrophysiology Neurophysiology