Add on for [NG]-Neuroguide. Currently available is cortical connectivity from 171 electrode combinations in a single display. Use the latest techniques to analyze coherence, phase differences, correlation, cross-spectrum, co-spectrum, quad-spectrum, bi-spectrum and phase reset. Evaluate volume conduction and zero phase lag, independent of volume conduction. Quantify the magnitude of coupling between different brain regions at different frequencies and examine in detail the important phenomena of phase reset.