Eeg machine (E1ectroencephalograph) is used to measure the bioelectric amplifier of eeg signals.A British doctor Richard caton observed brain waves in 1875, first in the animals.Due to William Eliot, Intel also electrocardiogram (ecg) for the success of encouraging, Hans berger decided to use string galvanometer to measure the electrical activity of the brain
First of all, berger will dog brain surface exposure, the determination of brain external current.Then he put the electrodes in has removed part of the skull in the human brain surgery under the scalp.Finally he can record through the skull brain waves, and gathered his family members, friends and other volunteers electroencephalography (eeg) (hereinafter referred to as "EEGs"). 

Berger first identify two different types of brain waves, he respectively the a and b wave, then name the other waveform with other Greek letters.When a person is thinking, and rest, sleep, the eeg shows different graphics.
Then, by the Japanese electronic medical ITO is considered the father of the good governance, perfecting its theory invented the eeg.
The brain is the command and control center, medical every involved in diseases of the brain, is often more complex refractory.Epilepsy is a kind of popular brain neurological diseases, the folk and known as epilepsy crazy, crazy lamb, etc., this disease is often repetitive seizures, to the patient's physical and mental health caused serious influence, abnormal eeg is the root of the attack.Then, actually eeg abnormalities may be what disease?Below is the authoritative expert introduction!
Expert introduction: abnormal eeg can be a depression, schizophrenia, mental illness, also may be a brain diseases such as metabolic disorders, such as poisoning, is more likely to have epilepsy, concrete and combined with the corresponding symptoms.
The abnormal electroencephalogram (eeg) what symptoms for epilepsy?
1, generalized seizures, epilepsy of generalized seizures half with aura, attack, some patients a shrill cries first, after the loss of consciousness and falling, have the whole body muscle stiffness, stop breathing, eye can be tilted, several seconds after the array twin convulsions, tic aggravate gradually, over tens of seconds, clonus period respiratory recovery, foaming at the mouth, such as tongue bite broken blood spray).
2, small attack: a small attack, can be a brief disturbance of consciousness or loss, and no body jerking.Daily can have multiple attacks, can sometimes have a rhythmic blink of an eye, head, two eyes look straight, upper limbs twitch.
3, exercise-induced attack: psychomotor attacks to attack suddenly, epileptic seizures is what circumstance?Are irregular and uncoordinated movements (such as sucking, chewing, looking for running, yelling, and struggle, etc.).The patient's move no motivation, no goal, blind and impulsive, attack last for hours, sometimes for several days.
4, limitations attack: commonly seen in patients with organic damage of cerebral cortex on one side of the Angle, the onset of fingers or toes twitch or paresthesia, can spread to the body side.When attacks involving the sides, is characterized by large attack.