EEG

Alternative Names: Electroencephalogram, Brain wave test

An EEG (electroencephalogram), or brain wave, test is done to find out more about epilepsy, sleep disorders, head injuries, confusion, hallucinations, and coma. You should have clean hair and avoid all drugs before the test. During an EEG, leads are stuck on to your scalp, and you may be asked to look at bright or flashing lights while a recording of your brain’s electrical activity is made. An EEG is painless and does not affect your brain in any way.

What is it?

An EEG detects and records the electrical activity within the brain.

An EEG can be done in your doctor’s rooms, a clinic, or in hospital. It takes about an hour to perform.

Why is it done?

An EEG is done to learn more about the brain and its functioning. Common indications include:

• Epilepsy
• Sleep disorders
• Head injuries
• Confusion and hallucinations
• Coma

What happens?

Before – how to prepare

You should wash your hair and avoid all hair sprays, gels, etc. You should avoid caffeine, alcohol, and other drugs (ask your doctor about any prescription medications you take) for at least 8 hours before the test.

During – how the test is done

You will lie on a couch and several leads are attached to your scalp (these are usually stick-on type leads). You will be asked to lie still with your eyes closed while the recording is made. You may be asked to look at bright lights, flashing lights, or other stimuli.

The whole procedure is painless.

After the test

The results will usually be available soon after the test is completed.

Risks and Compilations

There are no recognised risks, although flashing lights, if used, have been known to precipitate epileptic seizures.

Special Issues

An EEG does not affect your brain in any way.

Short Description

An EEG (electroencephalogram), or brain wave, test is done to find out more about epilepsy, sleep disorders, head injuries, confusion, hallucinations, and coma.

Keywords

electroencephalogram, brain wave test, EEG