Omni EEG Lab http://omnieeglab.com Providing Mobile EEG Services Thu, 15 Sep 2011 22:30:45 +0000 en hourly 1 http://wordpress.org/?v=3.2.1 What is an EEG? http://omnieeglab.com/what-is-an-eeg/ http://omnieeglab.com/what-is-an-eeg/#comments Fri, 18 Jan 2008 19:28:34 +0000 admin http://www.elegantwordpressthemes.com/preview/GrungeMag/?p=65 Electroencephalography (EEG) is the recording of electrical activity along the scalp produced by the firing ofneurons within the brain.[2] In clinical contexts, EEG refers to the recording of the brain’s spontaneous electrical activity over a short period of time, usually 20–40 minutes, as recorded from multiple electrodesplaced on the scalp. In neurology, the main diagnostic application of EEG is in the case of epilepsy, as epileptic activity can create clear abnormalities on a standard EEG study.[3] A secondary clinical use of EEG is in the diagnosis of coma, encephalopathies, and brain death. EEG used to be a first-line method for the diagnosis of tumors, stroke and other focal brain disorders, but this use has decreased with the advent of anatomical imaging techniques such as MRI and CT.

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.

 

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