When a person is experiencing a seizure, it is not always true, or it does not also mean that the person will also experience convulsions. This also holds in the otherwise case that is, when a person is having convulsions, it is not always true that in the case that he would experience seizures. This means that seizures and convulsions are not always mutually inclusive.
Seizures basically involve the abnormal or very rapid and vigorous neuronal activity which occurs in the human brain while convulsions are actually characterized by or they feature abnormal, paranormal, or involuntary muscle contractions or particular jerky movements of the muscle. A convulsion is often and, most times, usually the very first diagnosis that would actually be given to any patient before or up to the time that a seizure disorder would be observed in the patient and then at that seizure would be established.