Depth EEG Recordings in Epileptic Patients During Hypnotic and Non-Hypnotic States
In the study of epileptic patients medically resistant, who are potential candidates for surgical treatment, depth EEG recording has been used for many years for the exact delimitation of the epileptogenic lesion. To our knowledge, hypnosis has never been induced in epileptic patients during EEG study. This neurosurgical diagnostic procedure offers a unique opportunity of obtaining fundamental information on the possible neurophysiological mechanisms implied in human hypnosis.
Observations were carried out on 3 consecutive patients affected by medically resistant partial seizures with elementary and/or complex symptomatology. Chronic deep electrode study explored rhinen-cephalic structures as well as specific target areas of the cerebral cortex.
Background electrical activity during the hypnotic state showed a significant decrease of slow and increase of alpha and beta rhythm, with a constant increase of amplitude, as compared with the non-hypnotic state. Focal interictal abnormalities were dramatically reduced by the hypnotic trance. Moreover depth EEG study during sleep in one patient indicated that the EEG patterns during hypnosis and sleep are basically different, confirming that there is no convincing evidence of physiological similarities between the two states.
KeywordsEpileptic Patient Alpha Rhythm Epileptogenic Lesion Hypnotic State Hypnotic Susceptibility
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