An electroencephalogram (EEG) is a test that detects electrical
activity in your brain using small, flat metal discs (electrodes) attached to your scalp


EEG - electroencephalogram test , which is used to detect abnormalities related to electrical activity of the brain. This procedure helps to track and record brain wave patterns.

Small metal discs with thin wires (electrodes) are placed on the scalp, and then send signals to a computer to record the results.

EEG used to confirm or rule out various condition like- seizure disorders, a head injury , encephalic brain tumor, sleep disorder, dementia etc.


  • Wash your hair the night before or the day of the test, but do not use any conditioner s, hair creams.
  • Avoid anything with caffeine 6 hours before the test.
  • Use your daily medications unless instructed otherwise.

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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