Electroencephalography

What is Electroencephalography?

Electroencephalography (EEG) is a non-invasive method to record electrical activity of the brain along the scalp. EEG measures voltage fluctuations resulting from ionic current within the neurons of the brain. as recorded from multiple electrodes placed on the scalp. Diagnostic applications generally focus on the spectral content of EEG, that is, the type of neural oscillations that can be observed in EEG signals.

EEG is most often used to diagnose epilepsy, which causes abnormalities in EEG readings. It is also used to diagnose sleep disorders, coma, encephalopathies, and brain death. EEG used to be a first-line method of diagnosis for tumors, stroke and other focal brain disorders, but this use has decreased with the advent of high-resolution anatomical imaging techniques such as magnetic resonance imaging (MRI) and computed tomography (CT). Despite limited spatial resolution, EEG continues to be a valuable tool for research and diagnosis, especially when millisecond-range temporal resolution (not possible with CT or MRI) is required.

Derivatives of the EEG technique include evoked potentials (EP), which involves averaging the EEG activity time-locked to the presentation of a stimulus of some sort (visual, somatosensory, or auditory). Event-related potentials (ERPs) refer to averaged EEG responses that are time-locked to more complex processing of stimuli; this technique is used in cognitive science, cognitive psychology, and psychophysiological research.

Questions and answers on "Electroencephalography"

My 19 month old has staring spells lasting 10 seconds comes and goes...started 3 weeks ago after hitting head . Then stopped altogether for 2 weeks...

doctor1 MD

Brief Answer:
Possible seizures after head trauma.

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my husband will bend his head over and his eyes are closed. He does this a lot during the day.

doctor1 MD

Brief Answer:
We need to exclude a seizure or a movement disorder.

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my son is 33 years old has bad choking cough doctors think it may be whooping cough he has black outs 6 in 2 days he shakes while he is passed out...

doctor1 MD

Brief Answer:
Brain involvement needs to be excluded.

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