Ad blocker interference detected!
Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers
Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.
While the device was pioneered in the 20th century, a version of the device was still in use aboard Federation starships in the mid-23rd century. In 2266, Doctor Leonard McCoy of the USS Enterprise used an electroencephalograph to study Dr. Simon Van Gelder's brain and detected highly abnormal levels of delta wave activity. (TOS novelization: Dagger of the Mind)