The invention relates to a system for sensing EEG signals on a living being, wherein the system includes multiple EEG electrodes for picking up electrical signals on the living being and at least one evaluation device connected to the EEG electrodes, wherein the evaluation device is configured to carry out at least the following steps:



a) picking up EEG signals from the EEG electrodes,
b) calculating at least bipolar and quadrupolar field components of the electrical field in the living being, which is the cause of the EEG signals, from the EEG signals,
c) determining at least one physiological key value of the living being from the calculated at least bipolar and quadrupolar field components.