electroencephalograph
- n medical instrument that records electric currents generated by the brain
- For three hours, each of the 40 snoozed in two sections of his laboratory (he could tell they were really asleep by means of an electroencephalograph, a brain machine with .
- Then he attached his analyzing machine to the electroencephalograph.
- The key to his scheme: the electroencephalograph, a device used by medical researchers to pick up electrical currents from various parts of the brain.