“…It has been somewhat generally accepted in the past that the electroencephalographic findings associated with unilateral subdural hematoma consisted of an ipsilateral reduction in amplitude of the alpha activity and/or a slow‐wave delta focus (16–18). However, more recent studies of large numbers of cases indicate that there are no characteristic electroencephalographic patterns in subdural hematoma and that the various types of brain injury can not be differentiated unequivocably by an electroencephalogram (9, 19).…”