Electroencephalography (EEG) is a neuroimaging electrophysiological monitoring technique for non-invasive recording of brain electrical activity, in which the state of the brain's neuroelectrical activity can be measured by placing electrodes along the scalp, and then recording the signals of the brain's spontaneous electrical activity over a period of time through multiple electrodes placed on the scalp. It can be used clinically for diagnosis of epilepsy, sleep disorders, depth of anesthesia, coma, encephalopathy and brain death in scenarios of different brain states on the one hand, and on the other hand, it can be used in the field of scientific research to provide a technological means of monitoring the brain activity, and it is also applied in computational neuroscience, brain-computer interface technology, and so on.
When we are acquiring this data, it is inevitable that the data acquisition process needs to be performed. In order to obtain a high quality EEG signal, a conductive paste needs to be applied between the scalp and the electrode cap to reduce impedance and improve signal quality during acquisition. The conductive paste (gel) enhances the electrically active connection between the electrode and the scalp and prevents environmental noise from contaminating the EEG signal.
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