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Titolo:
ANATOMICAL ORIGIN OF DEJA-VU AND VIVID MEMORIES IN HUMAN TEMPORAL-LOBE EPILEPSY
Autore:
BANCAUD J; BRUNETBOURGIN F; CHAUVEL P; HALGREN E;
Indirizzi:
CHRU PONTCHAILLOU F-35033 RENNES FRANCE CTR PAUL BROCA,INSERM,U97 F-75014 PARIS FRANCE HOP ST ANNE F-75674 PARIS FRANCE
Titolo Testata:
Brain
, volume: 117, anno: 1994,
parte:, 1
pagine: 71 - 90
SICI:
0006-8950(1994)117:<71:AOODAV>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
EXPERIENTIAL PHENOMENA; HIPPOCAMPUS; AMYGDALA; LANGUAGE;
Keywords:
SUPERIOR TEMPORAL GYRUS; AMYGDALA; HIPPOCAMPUS; ELECTRICAL STIMULATION; AURA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
78
Recensione:
Indirizzi per estratti:
Citazione:
J. Bancaud et al., "ANATOMICAL ORIGIN OF DEJA-VU AND VIVID MEMORIES IN HUMAN TEMPORAL-LOBE EPILEPSY", Brain, 117, 1994, pp. 71-90

Abstract

Jackson (Brain 1898; 21: 580-90) observed that seizures arising in the medial temporal lobe may result in a 'dreamy state', consisting of vivid memory-like hallucinations, and/or the sense of having previouslylived through exactly the same situation (deja vu). Penfield demonstrated that the dreamy state can sometimes be evoked by electrical stimulation of the lateral temporal neocortex, especially the superior temporal gyrus. Halgren et al. (Brain 1978; 101: 83-117) showed that the dreamy state can be evoked by stimulation ofthe hippocampal formation and amygdala and Gloor (Brain 1990; 113: 1673-94) has suggested that itis evoked by lateral stimulation only when the resulting after-discharge spreads medially. In order to resolve the relative importance of these areas, we considered the mental phenomena observed in epileptic patients with electrodes stereotaxically implanted into different brainareas for seizure localization prior to surgical treatment. Sixteen patients, all with seizures involving the temporal lobe, experienced the dreamy state either as a result of spontaneous seizures (nine dreamystares in six patients), or due to electrical stimulation (43 in 14) or to chemical activation (five in three). Deja vu and hallucinations of scenes were often evoked by different stimulations of the same electrode in the same patient. As Jackson had also observed, the dreamy state could occur alone but was often associated with epigastric phenomena and fear, and followed by loss of contact and oro-alimentary automatisms, and then by simple gestural automatisms, all characteristic of partial seizures beginning in the medial temporal lobe. Furthermore, as also emphasized by Jackson, the dreamy state was seldom associated with sensory illusions. Stimulation of either the neocortex (15 occurrences), anterior hippocampus (17) or amygdala (10) could evoke a dreamystate. However, since Sewer hippocampal and amygdala leads were stimulated than temporal neocortical, the proportion of medial temporal electrodes where dreamy stares could be evoked was much higher than in the neocortex. Most responsive lateral temporal sites were located in the superior temporal gyrus, rather than the middle temporal gyrus whichwas significantly less responsive. In 85% of dreamy states evoked by medial temporal lobe stimulation, the discharge spread to the temporalneocortex; and In 53% of dreamy states evoked by lateral temporal stimulation, the discharge spread medially. Considering all dreamy states, the amygdala was involved (as the stimulated structure, or as the site of ictal- or after-discharge) in 73% of cases, the anterior hippocampus in 83% and the temporal neocortex in 88%. In every spontaneous seizure where the dreamy stare was observed, the amygdala, anterior hippocampus and temporal neocortex were all involved (provided that they were recorded during the seizure). Thus, we conclude that the dreamy state probably depends upon a neuronal network that engages both medial and lateral aspects of the temporal lobe, and that the anterior hippocampus, amygdala and superior temporal gyrus have relatively priviledged access to this circuit.

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Documento generato il 19/01/20 alle ore 09:12:03