Electroencephalogram (eeg) today want to and you talk about something, but knew that spread their own learning experience and expression ability is limited, and it is also the novice level of electroencephalogram (eeg), write things matter also doesn't matter, if only perpetuated this misunderstanding is in the conscience.But on second thought, Daniel said they don't have time electroencephalography (eeg), I am a rookie to write, although unavoidably mangled, but each station friend since the eye, will be able to distinguish.
Basic principles:
Electroencephalogram (eeg) to say, the simple understanding of the principles of electroencephalogram (eeg) is first.Electroencephalogram (eeg), according to the electrode placed in intracranial or extracranial can be divided into the scalp eeg, intracranial electrode eeg electrode.Here is you often come into contact with the scalp eeg electrode.Electroencephalogram (eeg) and electrocardiogram (ecg), electromyography, instrument is used to record electrical activity.

Eeg machine
The scalp of eeg from scalp electrode will spontaneous electrical activity of the brain to amplify record for graphics.Brain electrical signal through the amplifier (because eeg signals are very weak, for mv or uv levels, and by the skull and the attenuation of scalp, so you need to pass through millions of times of amplification to display), filter (interference) and form that we see the graphics.
The average reference electrode is to each record of scalp electrodes respectively a resistor in series, parallel, through the processing, the scalp potentials is weakened and the average of each point potential close to zero.Is the average reference electrode (abbreviated as AV, see the word don't disorderly want to) as a G2 side.But if a scalp electrode has a very high potential, unable to completely eliminate the above processing, the average reference electrode potential (reference electrode activation), forming the electroencephalogram (eeg) would also be affected, with ear reference electrode activation is the same reason.
Lead, is to a point on the scalp electrodes (G1) respectively connected to a reference electrode (G2).There are other connection, called bipolar lead.Of bipolar lead is record two electrodes respectively as G1, G2 side formed by the image of electroencephalogram (eeg).
Today first here, you can be in accordance with the method of eeg machine small make up say to consider, master the basic principle, it will be easier to understand.