The term EEG stands for electroencephalography, which is an experimental method in medicine and neuroscience. The procedure is non-invasive and completely harmless.
The EEG method allows us to record the changes of the brain’s neuro-electric activity at the scalp in response to stimuli. Small electrodes—which are hollow, like tiny doughnuts—are mounted on an electrode cap which resembles a bathing cap. These electrodes conduct the voltage changes that are produced by the brain and are measureable on the scalp. These electrical charges are called brain potentials.
Good conductivity between the electrode and the scalp is necessary to get a viable EEG recording. The participant might therefore need to wash her hair in advance of the experiment, to get rid of oils and cosmetic products. Contact between the electrode and the scalp is established by means of a gel that is injected into the hollow electrodes. While the cap is being fitted and the gel applied, the participant reads the experiment instructions, and has the opportunity to ask questions. Next there is a practice run so that the participant gets used to the experiment, and after that the actual experiment begins.
During the recording, participants read or listen to short texts. After each text, they carry out a task (such as a judgement or comprehension question). Our professional laboratory and medical-technical assistants are always on hand to explain the procedure.