Neurodiagnostics Glossary

Mathematical technique used to estimate the location and orientation of electrical sources in the brain.

Electrocorticography; direct brain surface electrical recording using implanted electrodes.

A test measuring the standing potential between the cornea and retina through eye movements.

Recording of electrical potentials from the cochlea and eighth cranial nerve.

Direct recording of electrical activity from the brain surface using implanted electrode grids.

Unwanted electrical signals in neurodiagnostic recordings caused by electrode-related technical problems such as poor co...

The electrical resistance between an electrode and the scalp, measured to ensure optimal signal quality in EEG recording...

Sudden reduction in EEG amplitude and increase in frequency, often occurring at seizure onset in certain epilepsy types.

A diagnostic test that records electrical activity in the brain using electrodes placed on the scalp.

A diagnostic test that measures electrical activity in muscles and peripheral nerves.

A diagnostic test measuring electrical responses of retinal cells to light stimulation.

Abnormal electrical brain activity resembling epileptic patterns but not necessarily associated with clinical seizures.

Electrical responses of the nervous system to specific sensory stimuli, measured to assess neural pathway function.

Late response in nerve conduction studies representing antidromic activation of motor neurons.

Spontaneous electrical activity recorded during needle EMG representing the firing of individual motor units, typically...

Frontal intermittent rhythmic delta activity, an abnormal EEG pattern suggesting deep midline brain dysfunction.

Localized abnormal EEG activity characterized by slower frequency waves in a specific brain region, suggesting underlyin...

Generalized periodic epileptiform discharges; bilateral synchronous EEG pattern indicating severe encephalopathy.

A monosynaptic spinal reflex evoked by electrical stimulation, used to assess spinal cord function and nerve conduction...

Brain waves above 80 Hz, considered biomarkers for epileptogenic tissue in seizure disorders.

Provocation technique during EEG recording using controlled deep breathing to elicit abnormal brain activity.

A graphical representation of sleep stages plotted against time during a polysomnography study, showing sleep architectu...

Relating to or occurring during a seizure or acute neurological event.

Occurring or present between seizure episodes, when the patient is not actively seizing.