The Electroencephalography (EEG) Laboratory is used to measure brain activity based on very weak electrical signals emitted by neuronal networks. EEGs make it possible to study different types of cognitive activity, i.e. spontaneous (Resting-State), in response to a stimulus –visual or pain, for example- (ERPs), or in response to a continuous rhythmic (Steady-State) somatosensory stimulation. EEGs can thus be used to study the processes of perception, decision, emotion and motor skills. The laboratory also produces accurate recordings of ocular activity, which can be used to relate the exploration of the visual stimuli presented with cortical activity.