Arrangement for analyzing local bioelectric currents in biological

Abstract

In an arrangement for analyzing local bioelectric currents in biological tissue complexes, electrical signals measured by EEG and/or MEG sensors are supplied to a pattern recognition unit in which defined signal patterns are acquired and are provided with time markings to produce 'templates.' The templates are forwarded to a correlation unit which compares the continuous measured values to the templates, and calculates a correlation coefficient based on the comparison. A threshold definition unit identifies signal patterns from the continuously measured signal which transgress the threshold, and supplies the threshold-transgressing signal patterns to a comparison unit which compares the correlated signal to the threshold-transgressing signal. Signal patterns are selected based on this comparison which are temporally and spatially identical, and are supplied to an averaging unit, which forms temporal averages of the selected signal patterns. A localization unit identifies the geometrical location of any source in the pattern which is pathologically electrically active. These geometrical locations are supplied to a monitor together with a tomographic portrayal of the same region of the subject, and are superimposed on the tomograph display.