Neurodiagnostics Glossary

An EEG display method where each electrode is referenced to a common inactive electrode, allowing direct visualization o...

Stereotyped EEG patterns that repeat at regular intervals, often indicating seizure activity or cortical irritability.

A technique testing neuromuscular junction function by delivering repeated electrical stimuli.

Stereoelectroencephalography; depth electrode recording technique for presurgical epilepsy evaluation.

The specific brain region where seizure activity originates, identified through ictal EEG patterns and clinical correlat...

The clinical signs and symptoms observed during seizures, used for seizure classification and localization.

An epileptiform discharge with duration of 80-200 milliseconds, indicating cortical hyperexcitability and potential seiz...

A specialized EMG technique measuring individual muscle fiber action potentials and neuromuscular transmission.

Subtraction ictal SPECT co-registered to MRI, a neuroimaging technique for epilepsy localization.

A comprehensive evaluation of sleep stage patterns, transitions, and timing derived from polysomnographic recordings to...

A polysomnographic parameter calculated as the percentage of total sleep time relative to the total time spent in bed du...

An abnormal sleep pattern where REM sleep occurs within 15 minutes of sleep onset, often indicative of narcolepsy or oth...

Burst of 11-15 Hz activity during stage 2 sleep, generated by thalamic pacemaker cells.

Sensory Nerve Action Potential - the compound electrical response recorded from sensory nerve fibers following stimulati...

A neurophysiological test that measures electrical brain responses to repetitive stimulation of peripheral sensory nerve...

Mathematical technique that decomposes neural signals into their constituent frequency components.

A characteristic EEG pattern consisting of sharp spikes followed by slow waves, typically associated with seizure activi...

Unwanted electrical signal produced by stimulation devices during evoked potential testing that can obscure or interfere...

The most common form of focal epilepsy, originating from temporal lobe structures and often associated with hippocampal...

EEG activity in the 4-7 Hz range, normally present during drowsiness and light sleep in adults.

Signal processing method that simultaneously analyzes how frequency content of neural signals changes over time.

Distinctive three-phase periodic discharges associated with metabolic encephalopathy, particularly hepatic failure.

Video-electroencephalography monitoring that simultaneously records brain waves and patient behavior for seizure correla...

Vertical electrooculography recording that monitors vertical eye movements to identify ocular artifacts in EEG.