Neurodiagnostics Glossary

The international standard method for EEG electrode placement based on anatomical landmarks.

A normal EEG wave pattern of 8-13 Hz frequency, typically seen in the posterior regions during relaxed wakefulness with...

Unequal voltage measurements between corresponding electrode pairs on opposite sides of the head, potentially indicating...

Process of identifying and removing non-neural signals from neurophysiological recordings.

Abnormal reduction in the frequency of normal background EEG rhythms, indicating diffuse cerebral dysfunction.

Fast EEG activity (13-30 Hz) normally seen over frontal and central regions during alert wakefulness.

Bilateral independent periodic lateralized epileptiform discharges; severe EEG pattern indicating diffuse brain dysfunct...

An EEG montage configuration where each channel represents the voltage difference between two adjacent electrodes, enhan...

An electrophysiological test of trigeminal and facial nerve function using electrical stimulation.

A test measuring electrical activity along the auditory pathway from ear to brainstem.

Increased amplitude and altered morphology of EEG rhythms over areas where the skull is defective or thinned.

An EEG pattern alternating between high-amplitude bursts and periods of suppressed activity, indicating severe brain dys...

A specialized neurodiagnostic technique that simultaneously records electrical activity from the corpus callosum and mus...

A quantitative measure expressing the number of central apnea events per hour of sleep, used to assess the severity of c...

Unit of electrical charge used in neurostimulation, equal to one ampere flowing for one second.

Statistical method measuring the degree of phase consistency between signals from different brain regions.

An amplifier characteristic that suppresses electrical signals common to both recording electrodes, thereby reducing env...

A visual display technique that compresses hours of EEG data into frequency-time plots.

A slow negative ERP component occurring between warning and target stimuli in cognitive tasks, reflecting expectancy and...

Extended electroencephalographic recording over hours to days for seizure detection.

Technique for identifying functional brain areas during neurosurgical procedures to preserve critical functions.

A sleep study procedure to determine the optimal continuous positive airway pressure settings for treating obstructive s...

Slow EEG activity below 4 Hz, normally seen in deep sleep but pathological when present during wakefulness.

Computer-based signal processing technique used in neurodiagnostic equipment to selectively enhance or suppress specific...