EEG patterns atlas
27 patterns, each with a simulated trace, what it looks like, what it means at the bedside, and its sources. Open any of them in the viewer to change the montage and the filters.
Normal
- Posterior dominant rhythmAlpha rhythm · 8–13 Hz
- Excess beta activityFast activity above 13 Hz
- Mu rhythmCentral arciform rhythm · 7–11 Hz
- Stage N2 sleepK-complexes and sleep spindles
- REM sleepLow-amplitude mixed frequency with sawtooth waves
Benign variants
- SREDASubclinical rhythmic electrographic discharge of adults
- Breach rhythmEffect of a skull defect
- Wicket spikesBenign temporal variant
Artefacts
- Eye blinkOcular artefact
- Muscle artefactEMG
- Mains interference50 or 60 Hz
- Electrode popElectrode artefact
- ECG artefactCardiac artefact
Slowing
- Focal polymorphic deltaFocal slowing
- GRDAGeneralized rhythmic delta activity (formerly FIRDA)
- Diffuse slowingGeneralized theta–delta background
Epileptiform
- Focal sharp wavesInterictal epileptiform discharges
- 3 Hz spike-and-waveGeneralized spike-wave discharge
- Focal electrographic seizureEvolving ictal rhythm
- BIRDsBrief potentially ictal rhythmic discharges
Periodic
- LPDsLateralized periodic discharges (formerly PLEDs)
- GPDsGeneralized periodic discharges
- GPDs with triphasic morphologyTriphasic waves
- Periodic sharp wave complexesSporadic Creutzfeldt-Jakob disease