Electroencephalography or EEG is a technique widely employed in hospitals and clinical centers. EEG allows to record the electrical activity of the brain with a very high temporal resolution, by means of electrodes located on the scalp, in a non-invasive and painless way. Indeed, neurons communicate with each other by sending tiny electrical signals, which regulate the release of neurotransmitters at the synaptic level. The synchronous activity of large populations of neurons generates electrical currents that can be recorded from the scalp. The Lab of Neurophysiology has several EEG recording systems that can be used alone, or in combination with other techniques.