What does EEG data tell you?
An EEG records the electrical activity of the brain via electrodes affixed to the scalp. EEG results show changes in brain activity that may be useful in diagnosing brain conditions, especially epilepsy and other seizure disorders.
How can I check my EEG signal quality?
The most commonly used method for evaluating the quality of the EEG signal is the impedance method, that is, applying the impedance between electrodes and human body to judge the EEG signal acquisition quality [5–8.
What does EEG stand for in medical terms?
An electroencephalogram (EEG) is a recording of brain activity. During this painless test, small sensors are attached to the scalp to pick up the electrical signals produced by the brain.
How are EEG results reported?
The EEG report is structured to include demographics of the patient studied and reason for the EEG; specifics of the EEG techniques used; a description of the patterns, frequencies, voltages, and progression of the EEG pattern that were recorded; and finally a clinical impression of the EEG significance.
What would an abnormal EEG mean?
Abnormal results on an EEG test may be due to: Abnormal bleeding (hemorrhage) An abnormal structure in the brain (such as a brain tumor) Tissue death due to a blockage in blood flow (cerebral infarction) Drug or alcohol abuse.
What do the numbers 10 and 20 mean in EEG measurements?
The “10” and “20” refer to the fact that the actual distances between adjacent electrodes are either 10% or 20% of the total front–back or right–left distance of the skull. For example, a measurement is taken across the top of the head, from the nasion to inion.
What is an EEG (EEG)?
EEG stands for “electroencephalography” which is an electrophysiological process to record the electrical activity of the brain. EEG measures changes in the electrical activity of the brain produced. Voltage changes come from ionic current within and between some brain cells called neurons.
What is the 10% Division in EEG?
When recording a more detailed EEG with more electrodes, extra electrodes are added using the 10% division, which fills in intermediate sites halfway between those of the existing 10–20 system. This new electrode-naming-system is more complicated giving rise to the Modified Combinatorial Nomenclature (MCN).
What is the sampling rate of an EEG?
EEG is recorded at sampling rates between 250 and 2000 Hz in clinical and research settings. More modern EEG data collection systems can record at sampling rates above 20,000 Hz if desired. Significantly lower hardware costs and total cost of ownership (TCO).