While studies have clearly shown a relationship between religious experiences and various brain disorders, there are several reasons why this association cannot be the only answer. First, not everyone with a brain disorder has unusual spiritual and religious experiences. In fact, only a small percentage of people with disorders such as temporal lobe epilepsy have unusual experiences. Second, there are people who have only one unusual experience in their entire life and never have another. This is in contrast to most people with brain disorders, who have repeated problems, such as multiple recurrent seizures. Third, too many people have religious experiences to believe that all of these people have some sort of disorder. Finally, many of these experiences result in dramatic changes in a person's perspective on life, death, and relationships. Such a radical change in perspective has never been consistently documented in people with brain disorders—unless, of course, they have a religious experience. This brings up the point that "normal" people can have normal or abnormal religious experiences, and "abnormal" people can have normal or abnormal religious experiences. Distinguishing between each of these groups is the difficult task of neuroscience