Seizures (or convulsions) are temporary alterations in brain function expressing themselves into a changed mental state, tonic or clonic movements and various other symptoms. They are due to temporary abnormal electrical activity of a group of brain cells.
The treatment of seizures is a subspecialty of neurology; the study of seizures is part of neuroscience.
Some seizure types are:
petit mal seizure
Simple partial seizure
partial complex seizure
generalized tonic-clonic seizure
So-called "Pokemon seizures