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Electroencephalography of an absence seizure with eyelid myoclonia in Jeavons syndrome. (A) The absence seizure was triggered by eye closure at X. Note the paroxysm of generalized, fast polyspike activity (X–Y). This seizure was semiologically characterized by eyelid myoclonus, hyperextension of the neck, and unresponsiveness. (B) Interictal generalized polyspike-wave discharges during sleep recorded from the same patient.
