What is an electroencephalogram?

An electroencephalogram (EEG) is a test used to evaluate the electrical activity in the brain. Brain cells communicate with each other through electrical impulses.

What does a flat flat EEG mean?

flat electroencephalogram. a graphic chart on which no tracings are recorded during electroencephalography, indicating a lack of brain wave activity. Flat readings are indicative of brain death except in cases of profound hypothermia and central nervous system depression.

What is the normal electroencephalogram (EEG)?

The normal electroencephalogram (EEG) varies by age. The prenatal EEG and neonatal EEG is quite different from the adult EEG. Fetuses in the third trimester and newborns display two common brain activity patterns: “discontinuous” and “trace alternant.”

What is an isoelectric encephalogram?

Flat or isoelectric encephalogram; an electroencephalogram with absence of cerebral activity over 2 mcv from symmetrically placed electrode pairs 10 (or more) cm apart, and with interelectrode resistance between 100-10,000 ohms; if such a record is present for 30 minutes in a clinically brain dead adult and if drug intoxication, hypothermia,…

Electroencephalography(EEG) is an electrophysiologicalmonitoring method to record electrical activity of the brain. It is typically noninvasive, with the electrodesplaced along the scalp, although invasive electrodes are sometimes used, as in electrocorticography, sometimes called intracranial EEG.

What is current usage in electroencephalography (EEG)?

Therefore, current usage in electroencephalography refers to the phenomenon as an eyelid fluttering artifact, rather than a Kappa rhythm (or wave). Some of these artifacts can be useful in various applications.

Who invented the electroencephalogram?

Franklin Offner (1911–1999), professor of biophysics at Northwestern University developed a prototype of the EEG that incorporated a piezoelectric inkwriter called a Crystograph (the whole device was typically known as the Offner Dynograph ).

How was the first EEG used to study animals?

Beck placed electrodes directly on the surface of the brain to test for sensory stimulation. His observation of fluctuating brain activity led to the conclusion of brain waves. In 1912, Ukrainian physiologist Vladimir Vladimirovich Pravdich-Neminsky published the first animal EEG and the evoked potential of the mammalian (dog).