Tonic phase of a generalized convulsive seizure is an independent predictor of postictal generalized EEG suppression.
Tao JX, Yung I, Lee A, Rose S, Jacobsen J, Ebersole JS. Tonic phase of a generalized convulsive seizure is an independent predictor of postictal generalized EEG suppression. Epilepsia. 2013 May; 54(5):858-65.