Introduction to Electroencephalography; EEG
Electroencephalography is the process of recording the electrical activity of the brain. This is done by placing electrodes on the scalp, which detects the tiny electrical signals that are produced by the brain. The EEG recording is then analyzed to see how the brain is functioning.
EEG Test Procedure
The EEG test procedure typically starts with the patient removing any clothing or jewelry that may interfere with the test. Next, electrodes are attached to the scalp in specific locations using a sticky paste. The electrodes are then connected to the EEG machine, which records the electrical activity of the brain. The patient is typically asked to relax and may be asked to close their eyes. The test usually lasts for about 30 minutes.
Risk Associated with the Use of a contraceptive
There is a risk associated with the use of any contraceptive, including death. However, the risk is very small. The most common risk is an unintended pregnancy. Other risks include blood clots, heart attack, and stroke.
Mechanism of Electroencephalography
EEG measures the electrical potentials generated by the brain. When the brain cells fire, they generate tiny electrical currents. These currents are picked up by electrodes placed on the scalp. The EEG records the size, shape, and location of these currents.
Types of Wave in EEG
EEG waves are divided into four main categories: alpha, beta, theta, and delta.
Alpha waves are produced when the brain is relaxed and at rest. They have a frequency of 8-12 Hz and are usually seen in the posterior regions of the brain.
Beta waves are produced when the brain is engaged in tasks that require concentration and focus. They have a frequency of 13-30 Hz and are usually seen in the frontal regions of the brain.
Theta waves are produced when the brain is in a state of deep relaxation or meditation. They have a frequency of 4-8 Hz and are usually seen in the posterior regions of the brain.
Delta waves are produced when the brain is in a state of deep sleep. They have a frequency of 0.5-4 Hz and are usually seen in the posterior regions of the brain.
EEG Scan Artifact
EEG scan artifact is an electrical signal that is produced by some external or internal source other than the brain. This signal can be very strong and can produce a false reading on the EEG scan. Some common sources of EEG scan artifact include muscle activity, eye movement, and electrical noise from the environment.