An EEG is a painless diagnostic test that records and analyzes brain waves. Electrodes are attached to the scalp and brain waves are transmitted to a computer for analysis. The test can be done while awake or asleep and usually lasts from half an hour to 60 minutes. Sedatives may be given if the test is done while sleeping.
An electroencephalogram (EEG) is a diagnostic test used by doctors to record and analyze brain waves. During an EEG scan, you can usually expect to relax comfortably, as the test is painless. In fact, the most concerning part may be sitting still if you have a tendency to get fidgety. In some cases, you may be given a sedative before an EEG scan, but that’s usually only to help you fall asleep if the scan is to take place while you’re sleeping. Usually, an EEG scan lasts from half an hour to 60 minutes.
When you are due for an EEG scan, you will likely be asked to relax in a position that is comfortable for you. For example, you may be asked to relax in a comfortable chair. Typically, an EEG technician will attach the electrodes to the scalp using adhesive. The adhesive is unlikely to cause damage to your scalp or hair. You can usually wash it off once you get home after the test.
The electrodes used for an EEG are flat metal discs that connect to a device used to transmit brain waves to a computer. The brain waves are magnified and recorded on the computer for the doctor’s analysis. The test only analyzes brain wave patterns. It cannot reveal your thoughts to the test taker or the doctor analyzing your brain waves.
You will likely spend most of an EEG scan with your eyes closed. However, the EEG technician can make multiple requests during the test. For example, he may ask you to open and close your eyes or look at a photograph. He may also ask you to read, solve a simple math problem, or stare at a light. It may even ask you to breathe deeply in an attempt to detect changes in your brain’s electrical activity.
If you’ve planned to take an EEG scan while you sleep, you’ll likely receive a sedative to help you sleep during the test. As with a regular EEG scan, this test is meant to record and evaluate your brain activity, which can look different when you’re asleep. You may, however, need to stay in the testing facility for a short time after an EEG scan done while you sleep. This will allow the sedative to wear off completely. You will probably need to have a friend or family member drive you home after the test, although this is usually not necessary if you are not receiving a sedative.
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