instruments for measuring and recording the electric activity of the brain. From a Greek word meaning "brain." Also called electroencephalograph or EEG for short. And I've had some of the fanciest encephalographs-EEGs they call them-hooked up to people, and make them worry and think to find out what energy is being consumed.instruments for measuring and recording the electric activity of the brain. From a Greek word meaning "brain." Also called electroencephalograph or EEG for short.