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Epilepsy begins in childhood in 60 % of cases ; 30,000 children and adolescents are diagnosed each year with epilepsy in the United States . A seizure is defined as : a paroxysmal involuntary disturbance of brain function that may be manifested as an impairment or loss of consciousness , abnormal motor activity , behavioral abnormalities , sensory disturbance , or autonomic dysfunction . Epilepsy is defined as : recurrent seizures unrelated to fever or to an acute cerebral insult .