EEG (Electroencephalograph)




Book Definition:

A device for recording brain waves, typically by electrodes places on the scalp. The record produced is also known as an electroencephalogram.

Additional Information:

1. An electroencephalograph scan records extremely weak voltage patterns known as brain waves. This scan can tell which parts of the brain are at work, or which parts are not working. A routine clinical EEG recording typically lasts 20–40 minutes (plus preparation time) and usually involves recording from 25 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.
  • To determine whether to warrant anti-epileptic medication.

2. An EEG is a test done by doctors where the plugs attached on your head detect brain waves. Those brain waves show up on a scanner and it tells the doctor what parts of your brain are high functioning and which parts might be working as they should or maybe not working at all.



In your own words:

  • A brain scan that shows which areas of the brain are active usually by placing electrodes on the scalp.
  • Used to find out where the most activity is within the brain.
  • An EEG is a test done by doctors where the plugs attached on your head detect brain waves. Those brain waves show up on a scanner and it tells the doctor what parts of your brain are high functioning and which parts might be working as they should or maybe not working at all.

Examples:



EEG_cap.jpg external image images?q=tbn:ANd9GcSrSDOR358Vg5B24-xcMKVbBMf0N-J4_ta8z8lW-yZ6IcZ962Ivjw
This may be done on someone who is sleeping to see what the brainwave patterns are while sleeping.
external image images?q=tbn:ANd9GcSeRsPi-RkhasvPnl_GqjdkPviyEXNvN5vUHUnU0BdLKA2Pg_haRQ

eeg2.jpg
EEG scan

Additional Resources

http://www.neurologychannel.com/neurodiagnostic-tests/index.shtml