 It is computed using quantitative electroencephalographic (QEEG) measures of brain wave patterns in an algorithm developed at the UCLA Laboratory of Brain, Behavior, and Pharmacology by Drs.Andrew Leuchter and Ian Cook.The cordance algorithm includes steps of (a) reattribution of EEG power, (b) spatial normalization of absolute and relative power, and (c) combination of the transformed absolute and transformed relative power to yield the cordance values themselves.