EEG & qEEG
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Normal variants14-and-6 positive bursts
Brief positive posterior-temporal bursts in drowsiness or light sleep.
14-and-6 positive bursts
Brief positive posterior-temporal bursts in drowsiness or light sleep.
Criteria & assessment
- Use a reference that demonstrates positive polarity; inspect both burst envelope and frequency.
Editorial draft · clinical review pending
Normal variantsLambda waves
Positive occipital transients associated with visual scanning.
Lambda waves
Positive occipital transients associated with visual scanning.
Criteria & assessment
- Verify occipital field and positive polarity with an appropriate reference.
Editorial draft · clinical review pending
Normal variantsMu rhythm
Central arciform rhythm that can attenuate with movement or sensorimotor activation.
Mu rhythm
Central arciform rhythm that can attenuate with movement or sensorimotor activation.
Criteria & assessment
- Compare central distribution with the posterior dominant rhythm.
- Document the movement interval when claiming blocking.
Editorial draft · clinical review pending
Normal variantsPositive occipital sharp transients of sleep
Positive occipital sleep transients, sometimes in trains.
Positive occipital sharp transients of sleep
Positive occipital sleep transients, sometimes in trains.
Criteria & assessment
- Demonstrate occipital field and positive polarity.
Editorial draft · clinical review pending
Normal variantsRhythmic midtemporal theta of drowsiness
Temporal theta trains without ictal evolution in a drowsy background.
Rhythmic midtemporal theta of drowsiness
Temporal theta trains without ictal evolution in a drowsy background.
Criteria & assessment
- Review onset, middle and offset before judging evolution.
Editorial draft · clinical review pending
Normal variantsSREDA
Subclinical rhythmic EEG discharge of adults, a seizure mimic with a characteristic clinical and electrographic context.
SREDA
Subclinical rhythmic EEG discharge of adults, a seizure mimic with a characteristic clinical and electrographic context.
Criteria & assessment
- Assess bilateral distribution, evolution and clinical state.
Editorial draft · clinical review pending
Normal variantsWicket waves
Arciform temporal activity occurring singly or in trains.
Wicket waves
Arciform temporal activity occurring singly or in trains.
Criteria & assessment
- Assess background continuity, temporal field, and absence of a stereotyped epileptiform after-going slow wave.
Editorial draft · clinical review pending