EEGs were recorded using hyperventilation test as activation procedures in 50 patients, who were proven cases of epilepsy with different seizure categories and compared with 50 age and sex matched normal subjects. Hyperventilation (HV) is being used as a activation/provocative test in clinical EEG laboratories to enhance preexisting abnormalities and / or induce abnormal findings in an otherwise normal electroencephalogram(EEG).The present work was done to compare the incidence of focal or generalized slowing, patterns of uncertain significance using activation methods on the EEG of normal young and adult subjects and the age matched epileptic subjects and also to quantify Changes in different seizure categories like Absent, Focal and Generalized.
