What does EEG discharge index less than 50 mean?

Occipital bone discharge is less than 50%. According to the family doctor's online statement, the EEG discharge index is less than 50, which means that the occipital lobe discharge is less than 50%. Electrodes attached to the scalp detected that less than 50% of the occipital lobe of the brain discharged and went to sleep. Electroencephalogram (EEG) is an examination technique of brain bioelectric activity.