Hi,
A normal EEG does not at all mean that one did not have a seizure.
During a
seizure, the electrical activity is abnormal. Once the
seizure is over, the brain rapidly returns to normal in most individuals. When an EEG is done several hours or even days later, it misses the changes in electrical activity that occurred during the actual seizure. But you mentioned that during EEG, there was muscle twitching but the EEG was normal.