Veterinary Electroencephalograph is an electronic device performing Electroencephalography (EEG) in animals.  It is used in neuroscience experimental research, neurology, and neurosurgery.

Electroencephalography (EEG) is an electrophysiological method to record electrical activity of the brain.  As opposed to EEG in humans, with recording electrodes (typically with conductive gel) placed on the the skin of the head (scalp), in animals, subdermal needle electrodes are used for EEG recording.

EEG measures voltage fluctuations resulting from ionic currents within the neurons and neural systems of the brain – both spontaneous electrical activity over a period of time, as well as under certain stimulation conditions that may influence the brain activity – event-related or evoked potentials (EPs) such as visual, auditory, somatosensory EPs. 

Diagnostic EEG applications generally focus either on event-related, evoked potentials or on the spectral content of EEG (EEG components or brain waves). 

Evoked potentials are relatively very faint signals which recording typically requires averaging of multiple responses to a stimulus, and are typically observed and analyzed in the time domain.

Spectral EEG content (spectral composition) is observed in EEG signals in the frequency domain.

EEG is often used in diagnostics of epilepsy, sleep disorders, depth of anesthesia, coma, encephalopathies, and brain death.

Despite the advent of high-resolution anatomical imaging techniques such as magnetic resonance imaging (MRI) and computed tomography (CT) and a limited spatial resolution, EEG continues to be a valuable tool for research and diagnostics.  It is also one of the few techniques for millisecond-range temporal (time) resolution which is not possible with CT or MRI.

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