Abstract: A portable medical device for automatically monitoring of electrical activity of target areas inside a patient is described. The medical device is based on a wireless communication network and includes a measuring unit that measures electrical signals at the surface of two target areas and a processing unit connected to the measuring unit. The processing unit includes a slave unit and a master unit for collecting and analyzing the measured electrical signals and presenting the result of the analysis for a clinician. The processing unit also includes a visualization unit connected to the master unit and an optional basic unit for at least presenting the result of the electrical signals and analysis, where the master unit and the basic unit perform an analysis of the electrical signals including an analysis of the coherence between the first and second sets of electrical signals as a function of the monitoring frequency.