The EEG is generated by the brain itself, through the EEG instrument and the graphics, no damage to the human brain. All living cells, all in the production of static electricity, known as the "biological". This electric current, a small, can not be used to measure the general method, but this will be magnified 10 million times, then you can draw out the drawing line. If you draw a picture of the brain, it is called an electroencephalogram. The same, and ECG, EMG, and so on. Although the line drawing is crooked, but has its regularity and scientific and professional personnel to understand its meaning, and accordingly make judgment of normal or abnormal.
In recent years, there is also a kind of "brain electrical map", which is a computer and a special electronic computer connected to the device. The EEG was amplified from the brain of the disk record after the input of the electronic computer, the processing into different shades of color graphics. Therefore, it is no longer a look at the curve, but a "topographic map" of the. EEG and brain electrical map of the brain tissue is reflected in the case of biological electricity, and do ECG, the human body will not cause any damage.