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PubMed This is a summary of 18 peer-reviewed journal articles Updated
Pediatric Neurology

The EEG: Your Child's Diagnostic Roadmap

At a Glance

For children with epilepsy with eyelid myoclonia, video-EEG links brief eyelid fluttering to generalized spike-and-wave activity. Eye closure, flashing lights, and recording after sleep can reveal seizures, while a normal short EEG does not always rule out the condition.

The most critical step in evaluating a diagnosis of epilepsy with eyelid myoclonia (EEM) is a specialized test called a Video-EEG [1][2]. Because the physical symptoms—like eyelid fluttering—can be so brief, doctors must see exactly what is happening in the brain at the same time the eyes are moving [3].

The Role of Video-EEG

A standard EEG (electroencephalogram) records the brain’s electrical activity using small sensors on the scalp. A Video-EEG adds a synchronized camera. A routine EEG with appropriate activation may establish the diagnosis, but prolonged Video-EEG or a sleep-deprived EEG is highly useful if the initial study is unclear [4]. This is essential for EEM because it allows your medical team to prove that the eye fluttering is directly linked to a specific electrical discharge in the brain [5]. Without the video, it is very difficult for a doctor to be certain if the movement is a seizure, a facial tic, or just a normal blink [6].

What the EEG Looks For

In a child with EEM, the brain produces a recognizable pattern during an episode. Doctors look for “generalized” activity, meaning it occurs across bilateral networks across the brain rather than in one small spot [7].

  • Spike-Wave Activity: The EEG will show “spikes” (sharp electrical jumps) followed by “waves” [5].
  • Frequency: In EEM, these spikes typically happen at a speed of 3 to 6 Hz (3 to 6 times per second) [3][8].
  • Duration: These bursts are usually very short, often lasting just a few seconds [9].

The EEG Checklist: Common Activation Procedures

To get an accurate diagnosis, an EEG for EEM often includes activation procedures—specific actions performed in a supervised setting meant to trigger the brain’s “reflex” response [1].

  1. Eye-Closure Testing: The technician must ask your child to open and close their eyes repeatedly in a well-lit room [10]. In EEM, the act of closing the eyes often triggers an immediate burst of spike-wave activity [5].
  2. Intermittent Photic Stimulation: This involves using a strobe light at different speeds [9]. Since most children with EEM are light-sensitive (photosensitive), this is a vital part of the test [11].
  3. Recording Upon Awakening: Research shows that eyelid fluttering is most likely to occur—and is most intense—right after a child wakes up [12]. A sleep-deprived EEG or recording right after sleep can be very helpful [12][13].
  4. Hyperventilation: Your child may be asked to blow on a pinwheel or breathe deeply for a few minutes. This is often used to evaluate for typical absence seizures, though it is not a defining trigger for EEM [14].

Distinguishing EEM from Other Conditions

Because the symptoms overlap, EEM is often confused with other types of epilepsy. The EEG provides supportive patterns to help doctors tell them apart:

  • Childhood Absence Epilepsy (CAE): In CAE, seizures are usually triggered by deep breathing (hyperventilation) rather than light or eye closure [15].
  • Juvenile Myoclonic Epilepsy (JME): While JME also involves “jerks,” these usually happen in the arms and legs, whereas in EEM, the jerks are mostly in the eyelids [7][16].
  • Facial Tics: If a child has tics, the EEG will not show seizure activity happening at the exact same time as the movement (though interictal abnormalities might still be present) [6].

When the First Test is Normal

It is possible for a child with EEM to have a normal initial EEG, especially if it was a short test that didn’t include the right triggers or didn’t capture the child waking up [4][7]. A normal result does not rule out the condition. If the doctor still suspects EEM based on your descriptions or home videos, they may recommend a longer recording or a “sleep-deprived” EEG to make the brain activity easier to see [13][17].

A Note on Other Tests

While the EEG is the primary diagnostic tool, other tests like a Brain MRI (which looks at the structure of the brain) are usually not required for typical EEM because the brain structure in this condition is almost always normal [1]. Genetic testing is sometimes suggested, especially if there is a family history of epilepsy or if the child has other developmental challenges [1][18].

Common questions in this guide

What does a video-EEG show in epilepsy with eyelid myoclonia?
A video-EEG records a child's movements and brain waves at the same time. In EEM, it can show whether eyelid fluttering occurs with generalized spike-and-wave activity, helping distinguish a seizure from a tic or normal blink.
What EEG pattern is associated with EEM?
Doctors typically look for brief generalized bursts of spike-and-wave activity at about 3 to 6 cycles per second. The bursts often last only a few seconds and may appear when the child closes their eyes.
What happens during an EEG for suspected EEM?
The test may include repeated eye opening and closing, flashing-light stimulation, and deep breathing. It may also include sleep deprivation or recording as the child wakes, because these situations can make the pattern easier to capture.
Can a normal EEG rule out epilepsy with eyelid myoclonia?
No. A brief EEG may miss EEM if it does not include the right triggers or the period after waking; the child's clinician may recommend a longer, repeat, or sleep-deprived video-EEG when concern remains.
Does a child with EEM need a brain MRI or genetic test?
A brain MRI is usually not needed when the presentation is typical because brain structure is generally normal. Genetic testing may be considered when there is a family history of epilepsy or other developmental concerns.
How is EEM distinguished from absence seizures, juvenile myoclonic epilepsy, or tics?
EEM is linked to eyelid jerks and often responds to eye closure or light, while childhood absence seizures are commonly evaluated with deep breathing and juvenile myoclonic epilepsy more often causes jerks in the arms or legs. A tic does not occur with a seizure discharge at the same moment on the EEG.

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Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Was my child's eyelid fluttering captured on video and synchronized with the EEG recording to confirm they happen at the same time?
  2. 2.Did the EEG show generalized spike-wave activity in the 3–6 Hz range?
  3. 3.Were all the necessary triggers tested, including repeated eye closure and strobe lights (photic stimulation)?
  4. 4.Did the recording include the period immediately after my child woke up, when seizures are most likely?
  5. 5.How did the EEG results help you distinguish this from childhood absence epilepsy or juvenile myoclonic epilepsy?
  6. 6.If this EEG was normal but we are still seeing eyelid fluttering, should we consider a repeat study or a longer video-EEG?

References

References (18)
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    International League Against Epilepsy classification and definition of epilepsy syndromes with onset in childhood: Position paper by the ILAE Task Force on Nosology and Definitions.

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    Eyelid myoclonia with absences related to epileptic negative myoclonus.

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This page explains EEG testing for epilepsy with eyelid myoclonia in children for informational purposes only and does not constitute medical advice. A pediatric neurologist should interpret your child's results and provide guidance for your specific situation.