EEG Study Guide 2026

BAEP waveforms contain frequencies predominantly in the 100–3000 Hz range; these bandpass settings preserve the fast transient potentials while rejecting low-frequency muscle artifact and EEG.

Eye closure sensitivity is a form of reflex epilepsy where epileptiform discharges are triggered by the act of closing the eyes, as opposed to the normal alpha rhythm that appears. It is distinct from fixation-off sensitivity.

The standard time base for routine EEG is 30 mm/second (equivalent to displaying 10 seconds per standard screen page), which provides optimal visualization of EEG waveform morphology and temporal relationships.

ACNS guidelines state that interelectrode impedances should be under 10,000 Ohms (10 kOhms) but over 100 Ohms. Impedances that are too high can lead to increased noise and artifact, while impedances below 100 Ohms may suggest a salt bridge or short circuit between electrodes. While values under 5 kOhms are often recommended, the acceptable range is up to 10 kOhms.

Praxis-induced or cognitive-task-induced epilepsy is a form of reflex epilepsy where specific mental activities (reading, calculating, spatial tasks) trigger epileptiform discharges or seizures, most commonly in genetic generalized epilepsies.

Polyspike-and-wave complexes contain a burst of two or more spikes before the slow wave, and are particularly associated with juvenile myoclonic epilepsy and other generalized epilepsies with myoclonic seizures.