Table 1.

Definition of seizure severity categories used during the study

Severity score	Symptoms
0	No tonic‐clonic seizure was observed during the experiment
1	Mild and short (<10 sec) seizures. No postictal symptoms
2	Intense tonic‐clonic seizure for less than 10 sec or subtle symptoms for longer than 10 sec
3	Violent tonic‐clonic seizure for more than 10 sec. Postictal signs of exhaustion for an extended period