Barwood T J, Empson J A, Lister S G, Tilley A J
Electroencephalogr Clin Neurophysiol. 1978 Nov;45(5):671-3. doi: 10.1016/0013-4694(78)90168-2.
Auditory evoked potentials to tone stimuli were recorded from 8 practised meditators before, during, and after meditation, and also during light sleep. No consistent changes were noted between baseline and meditating AEPs, or between meditating and sleep AEPs.