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Eye-closure sensitivity and fixation-off sensitivity (FOS) in genetic generalized epilepsy. (A) Generalized spike-wave and polyspike-wave discharges appear after eye closure (C) and fades away after one second indicating eye-closure sensitivity. (B) Generalized epileptiform discharges appear with eye closure (C), continues as long as eyes are closed, and disappears on eye opening (O) indicating FOS.
