Theta: is normal on an EEG especially with late hyperventilation or drowsiness. Persistent focal theta (4 cps) activity may be abnormal and could represent the presence of a structural lesion or post ictal slowing but in your situation, the other side slows as well and is likely a normal finding. Delta slowing (4 cups or less) is almost always abnormal if not associated with certain stages of sleep).
Answered 5/23/2016
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