What is an EEG test used to diagnose?
The electroencephalogram (EEG) is a medical test used to measure the electrical activity of the brain. A number of electrodes are applied to your scalp. EEG can help diagnose a number of conditions including epilepsy, sleep disorders and brain tumours.
What does amplitude mean in EEG?
Amplitude, EEG: Is a measure of the change of EEG signals with respect to the mean value, usually measured in microvolts (µV), and often expressed as the difference between the maximum and minimum deviation (i.e. peak-to-peak), or in rectified EEG from baseline-to-peak.
What does frequency mean in EEG?
The electroencephalogram (EEG) is the depiction of the electrical activity occurring at the surface of the brain. Frequency (Hertz, Hz) is a key characteristic used to define normal or abnormal EEG rhythms. Most waves of 8 Hz and higher frequencies are normal findings in the EEG of an awake adult.
What is synchrony in EEG?
Synchrony in EEG data is at times defined simply. as simultaneous occurrence at two electrode sites, either on a single head, or. on two separate heads, of brainwaves within a particular frequency band.
Can EEG detect tumor?
EEG can also detect abnormal brain waves after a head injury, stroke, or brain tumor. Other conditions such as dizziness, headache, dementia, and sleeping problems may show abnormal brain patterns. It can also be used to confirm brain death.
Why would a doctor order an EEG?
Most commonly, healthcare providers use an EEG to check for seizure activity related to epilepsy. EEGs can also help monitor health conditions or find out what’s causing certain symptoms. Healthcare providers may use an EEG during brain surgery or to test the brain activity of someone in a coma.
What is brain wave frequency?
2.1. 1 Brain Waves
| Frequency band | Frequency | Brain states |
|---|---|---|
| Beta (β) | 12–35 Hz | Anxiety dominant, active, external attention, relaxed |
| Alpha (α) | 8–12 Hz | Very relaxed, passive attention |
| Theta (θ) | 4–8 Hz | Deeply relaxed, inward focused |
| Delta (δ) | 0.5–4 Hz | Sleep |
What is synchrony and alpha block?
synchrony: when there is an alpha rhythm (patient is relaxed with eyes closed), the waves are uniform, in amplitude and frequency. Alpha block is when beta waves start to interfere with the alpha rhythm; the patient is stimulated by different kinds of stimuli from the environment. eyes open.
What is neural synchrony?
the simultaneous firing or activation of neurons in multiple areas of the brain, particularly in response to the same stimulus.
