Seizure in infantile spasms

Do you see the abnormality?  Surprisingly in this case it's not on the left side!  The high voltage chaos that looks as good right-side-up as up-side-down is characteristic for hypsarrhythmia in infantile spasms.  However, what should catch your eye is the pseudonormalization on the right half of the record: this is a seizure in infantile spasms – high frequency, low amplitude.  Neither side is normal, but that relative depression of the record with a global high frequency oscillation doesn't look normal for the record in this presumably awake child.