This includes surface Z-Scores referenced to an internationally recognized database of normal EEGs from the Brain Research Laboratories (BRL) of New York University Medical Center. This allows the computation of Z-Scores for 6,239 brain voxels, computed from live or retrospective EEG records using 19 channels of surface EEG. Surface EEG data are instantaneously converted into EEG power estimates by frequency for 5 millimeter voxels, and compared to age-regressed equations for normal individuals. Each voxel produces a Z-Score (0=normal) indicating the statistical deviation of that voxel deviates from the age expected normal values. This provides a rapid and accurate imaging technique, useful for assessment and evaluation as well as for neurofeedback. Surface Live Z-Scores are available for absolute power, relative power, interhemispheric power asymmetry, coherence, and phase, for 10 frequency bands. Before implementation of the normative equations careful consideration is taken to equate amplifiers.
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