What does brain electrode mean

A brain electrode is a medical device used to record the electrical activity of a person's brain. It reflects the activity of the brain by recording the electrical signals from neuron discharges in the human brain by attaching electrodes to the surface of the scalp. The general term for electrodes used to collect electrical signals from the brain or to perform electrical stimulation of the brain includes intracranial cortical electrodes, deep intracranial electrodes, SEEG electrodes, stereo electroencephalogram electrodes, microelectrodes, and many other types. Among them, intracranial cortical electrodes are intracranial electrodes that are surgically placed under the dura mater of the skull and mainly collect cortical signals. Intracranial cortical electrodes can accurately monitor brain wave signals and have the functions of EEG signal acquisition and cortical surface recording. According to different shapes, intracranial cortical electrodes can be categorized into strip electrodes and grid electrodes, of which grid electrodes are the mainstream products in the market, accounting for more than 65% of the output value. From the size point of view, with the related technical progress, the intracranial cortex electrode size is gradually realized from the centimeter level (10-2m), millimeter level (10-3m) and then to the micron level (10-3-10-5m) of the technological upgrading of the EEG signal frequency band from 10-1hz gradually upgraded to 100Khz.