Human Cortical Electrogenesis: Stratigraphy and Spectral Analysis

Péronnet, F; Sindou, Marc; Laviron, A; Quoex, F; Gérin, P

doi:10.1007/978-3-7091-8306-9_16

Cited by 10 publications

(1 citation statement)

References 15 publications

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“…(1) The electrocorticogram recorded from the cortical surface seems to be composed of several activities which seem to arise at different cortical layers, reaching more or less up to the surface and even existing independently of each other. This is in complete agreement with the results reported by workers studying the laminar activities of the cortex (Scherrer and Calvet 1972;Peronnet et al 1972). If there is, in seizures, a close relationship between wave patterns at the surface and at deep intracortical layers, some synchronizing force in the vertical direction of the cortex is to be hypothesized.…”

Section: ( 2 ) Bioelectrical Activity and Cortical Structuresupporting

confidence: 93%

The Epileptogenic Effect of Ouabain (g‐Strophanthin) Its Action on the EEG and Cortical Morphology

Petsche¹,

Rappelsberger²,

Frey³

et al. 1973

Epilepsia

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SUMMARY Local application of ouabain in agar on the cerebral cortex elicits generalized seizures. Progressive deterioration of the uppermost cortical layers takes place, related in extent and degree to the concentration of the drug and duration of application. The seizure patterns under ouabain start earlier and are more apt to be of hippo‐campal type when the concentration of the drug is high. The decrease in voltage of the seizure activity is related to the increasing number of neurons destroyed. Finally relations between EEG and clinical seizure patterns are described. Particularly in later stages of status epilepticus, the relation between cortical transients and jerks of the limbs decreases, and the conclusion is drawn that deep brain centers increasingly take over the role of pace‐makers for myoclonic jerks. The results are discussed with respect to the mechanisms both of the action of ouabain and of neurophysiological events during ouabain seizures. RÉSUMÉ Ľapplication locale ďouabaine sur agar, sur le cortex cérébral provoque des crises généralisées. Une détérioration progressive des couches corticales les plus super‐ficielles prend place, liééàľétendue et au degré de concentration de la drogue et à la durée de ľapplication. Les types de crises sous ouabaíne apparaissent plus précocement et sont plutôt de type hippocampien, ďautant plus que la concentration de la drogue est plus élevée. La diminution de voltage de ľactivité critique est en relation avec ľaugmentation du nombre de neurones détruits. Ensuite les relations entre les patterns EEG et les crises cliniques sont décrites. En particulier dans la période tardive des états de mal, on observe une diminution des relations entre les décharges corticales et les secousses des membres. On tire la conclusion que les structures cérébrales profondes prennent progressivement le rôle de plus en plus important, comme pace‐maker dans ľorigine des secousses myocloniques. Les résultats sont discutés en ce qui concerne les mécanismes à la fois de Taction de ľouabaïne et des phénomènes neurophysiologiques pendant les crises provoquées par ouabaïne. ZUSAMMENFASSUNG Lokale Applikation von Ouabain in Agar auf den Cortex verursacht generalisierte Anfälle. Es kommt zu einer zunehmenden Zerstörung der oberflächlichen kortikalen Schichten, deren Ausmass von der Konzentration des Ouabains und der Dauer der Einwirkung abhängt. Die Anfallsmuster beginnen umso früher, je stärker die Konzentration von Ouabain ist. Die Amplitudenabnahme, die im Lauf des Status eintritt, steht in Beziehung zur Anzahl der Neuronen, die durch Ouabain zerstört werden. Die Beziehungen zwischen EEG‐Mustern und klinischem Anfallsmuster werden untersucht. Besonders in Spätstadien des Status epilepticus nimmt die anfangs so klare Beziehung zwischen korticalen Entladungen und Myoklonismen ab, woraus gefolgërt wird, dass nun Regionen in der Tiefe des Gehirns mehr und mehr die Rolle von Pace‐makers für die Myoklonismen iibernehmen. Die Ergebnisse werden diskutiert im Hinblick auf die Mechanismen der Ouabain...

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Section: ( 2 ) Bioelectrical Activity and Cortical Structuresupporting

confidence: 93%

The Epileptogenic Effect of Ouabain (g‐Strophanthin) Its Action on the EEG and Cortical Morphology

Petsche¹,

Rappelsberger²,

Frey³

et al. 1973

Epilepsia

View full text Add to dashboard Cite

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Intracortical Aspects of the Synchronization of Self-Sustained Bioelectrical Activities

Petsche

Rappelsberger

Frey

1972

Synchronization of EEG Activity in Epilepsies

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Reflection of the pattern of cortical activation in the phase structure of the human EEG

Getmanenko

Belov

Kanunikov

et al. 2007

Neurosci Behav Physiol

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A total of 22 healthy subjects in the EEG laboratory and 62 patients in the clinical functional diagnostic unit were studied. Spontaneous EEG recordings were made using the 10-20 scheme relative to combined ear electrodes in the state of rest with the eyes closed and open and during various functional loads. Traces were analyzed by computer animation of the EEG phase structure. The main concept of the method for extracting phase structure was based on not using a single reference lead. Time shifts were measured only between neighboring electrodes, with the result that the oscillations being compared were highly coherent. Time discordance was assessed in terms of the shift in the peak of the cross-correlation function. The results showed that from the point of view of phase structure, the differences between the high-and low-frequency EEG rhythms were purely quantitative. Qualitatively, the properties of the rhythms were identical and were reduced to slow (in the seconds range) oscillations of phase shifts. Low-frequency activity was characterized by large (in absolute terms, msec) phase shifts from electrode to electrode as compared with high-frequency activity. The phase shifts of potentials formed a structure which was overall very similar in different subjects and was reproduced in different leads. The initial appearance of EEG waves was statistically linked with the main sensory projections--the visual (occipital areas), auditory (temporal areas), and somatic (parietal areas), with addition of the frontal areas. Rearrangement of phase leadership in favor of the occipital pole at the expense of both temporal areas was observed on opening the eyes. This appears to depend on the level of sensory influx to this cortical area from the thalamus. It is suggested that the direction of the phase gradient reflects a gradient of cortical current density parallel to the surface. This can be used to locate compact sources lying close to the surface.

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Human Cortical Electrogenesis: Stratigraphy and Spectral Analysis

Cited by 10 publications

References 15 publications

The Epileptogenic Effect of Ouabain (g‐Strophanthin) Its Action on the EEG and Cortical Morphology

The Epileptogenic Effect of Ouabain (g‐Strophanthin) Its Action on the EEG and Cortical Morphology

Intracortical Aspects of the Synchronization of Self-Sustained Bioelectrical Activities

Reflection of the pattern of cortical activation in the phase structure of the human EEG

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