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- W2016194098 abstract "The relationships between theta rhythm and epileptic spikes, evoked by penicillin, were studied in the rat hippocampus. Records were taped and processed off-line, and autocorrelation functions, averages and power spectra of the EEG and frequency histograms of the epileptic spikes were calculated. Results showed that: (1) epileptic spikes tend to occur in a preferred phase of theta rhythm; (2) they provoked a reset of the phase of theta rhythm, acting as internal stimuli; (3) epileptic spikes decreased in frequency and were often abolished when theta rhythm was evoked; (4) these effects appeared to be dependent on the medial septal pathway. These findings indicate the existence of an antagonism between two hippocampal phenomena (epilepsy and theta rhythm). On the other hand, they also seem to be interrelated since the generation of one is accompanied by a reciprocal decrease in the other. Les relations entre le rythme thêta et les pointes épileptiques induites par la pénicilline furent étudiées dans l'hippocampe du rat. Les enregistrements furent faits sur bandes magnétiques puis traités ensuite afin d'évaluer les finctions d'autocorrélation, des moyennes, le spectra de puissance de l'EEG, les histogrammes de fréquence des pointes épileptiques. Les résultats montrèrent que: (1) les pointes épileptiques tendaient à apparaître dans certaines phases préférentielles du rythme thêta; (2) elles provoquaient un recalage de la phase du rythme thêta en agissant comme des stimulus internes; (3) la fréquence des pointes épileptiques décroissait et souvent les pointes furent abolies lorsque le rythme thêta était évoqué; (4) ces effets seraient dependant de la voie septal-médiale. Ces données indiquent l'existence d'un antagonisme entre deux phénomènes hippocampiques (épilepsie et rythme thêta). Il semblerait toutefois qu'il y ait interrelation entre eux puisque l'apparition de l'un s'accompagne d'une diminution de l'autre." @default.
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- W2016194098 title "Interactions between hippocampal penicillin spikes and theta rhythm" @default.
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