EEG

An electroencephalogram (EEG) is a recording of brain activity. During the test, small sensors are attached to the scalp to pick up the electrical signals produced when brain cells send messages to each other. These signals are recorded by a machine and are looked at by a doctor later to see if they're unusual.
A routine clinical EEG recording typically lasts 20–30 minutes (plus preparation time) and usually involves recording from scalp electrodes. Routine EEG is typically used in the following clinical circumstances:
  • to distinguish epileptic seizures from other types of spells, such as psychogenic non-epileptic seizures, syncope (fainting), sub-cortical movement disorders and migraine variants.
  • to differentiate "organic" encephalopathy or delirium from primary psychiatric syndromes such as catatonia
  • to serve as an adjunct test of brain death
  • to prognosticate, in certain instances, in patients with coma
Several other methods to study brain function exist, including functional magnetic resonance imaging (fMRI), positron emission tomography, magnetoencephalography (MEG), Nuclear magnetic resonance spectroscopy, Electrocorticography, Single-photon emission computed tomography. Despite the relatively poor spatial sensitivity of EEG, it possesses multiple advantages over some of these techniques:
  • Hardware costs are significantly lower than those of most other techniques.
  • EEG prevents limited availability of technologists to provide immediate care in high traffic hospitals.
  • EEG is silent, which allows for better study of the responses to auditory stimuli.
  • EEG sensors can be used in more places than fMRI, SPECT, PET, MRS, or MEG, as these techniques require bulky and immobile equipment.
A sleep-deprived EEG test is done when you have had less sleep than usual. When you are tired, there is more chance that there will be unusual electrical activity in your brain. Your doctor may ask you to have this test if you have had a standard EEG test, but it didn't show any unusual electrical activity.
Electroencephalography (EEG) is a non-invasive method to record electrical activity of the brain along the scalp. EEG measures voltage fluctuations resulting from ionic current flows within the neurons of the brain.
The electroencephalogram (EEG) is a recording of the electrical activity of the brain from the scalp. The recorded waveforms reflect the cortical electrical activity. Signal intensity: EEG activity is quite small, measured in microvolts (mV).

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