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Electroencephalography (contracted in EEG) is an Earth technology able to register the electrical activity of the brain (TV: Spearhead from Space) and show the brainwaves of an individual. (TV: Planet of the Spiders)
While in a self-induced coma post-regeneration, the test was made on the Third Doctor, showing no activity. (TV: Spearhead from Space)
The Third Doctor performs such a test on the clairevoyant Herbert Clegg. (TV: Planet of the Spiders)