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• W2029351017 startingPage "1039" @default.
• W2029351017 abstract "In human neocortical slices obtained during epilepsy surgery, sharp waves have been described to appear spontaneously, the shape of which met all criteria of epileptiform field potentials. In the present investigation, the current sinks and sources underlying these potentials were analysed. The cortical tissue used in the present study was a small portion of the tissue blocks excised for treatment of pharmacoresistant focal epilepsy. The tissue came from the temporal (n = 26), frontal (n = 1) and parietal (n = 1) lobes. Slices of 500 microm thickness were cut in the frontal plane perpendicular to the pial surface. Field potentials were recorded using a linear array of eight wire electrodes (diameter: 33 microm) with interelectrode distances of 300 microm. To scan a slice for sharp field potentials, this array was placed perpendicular to the pial surface at the midsection of each preparation, and consecutively at the respective midsections of the resulting halves of the slice. Each of these locations was termed a recording line. Depending on the appearance of spontaneous potentials, recording lines and slices were classified as either spontaneous or non-spontaneous. With both spontaneous and zero Mg(2+)-induced interictal discharges, in spontaneous slices, current sinks were preferentially located in layers II and III. In non-spontaneous slices, current sinks associated with interictal potentials could be found throughout all cortical laminae. With zero Mg(2+)-induced ictal activity, in spontaneous slices, the initial sinks were preferentially located in cortical laminae II and IIIa, and were shifted to lower ones after additional application of bicuculline. In non-spontaneous slices, no ictal-type discharges could be induced with omission of Mg2+ from the superfusate. Only addition of bicuculline elicited ictal-type activity, and sinks associated with this were preferentially located in layers II and IIIa. The results suggest that the supragranular layers, especially layer II, change qualitatively in functional organization in slices showing spontaneous discharges. We think that this special feature represents the function of the upper layers and can be blocked by bicuculline. This interpretation is supported by the observation that ictal discharges normally started in the upper layers in spontaneous and non-spontaneous slices, except for spontaneous slices with bicuculline, where the zone initiating discharges was translocated to deeper layers." @default.
• W2029351017 created "2016-06-24" @default.
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• W2029351017 date "1999-11-01" @default.
• W2029351017 modified "2023-09-27" @default.
• W2029351017 title "Current-source-density profiles associated with sharp waves in human epileptic neocortical tissue" @default.
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• W2029351017 doi "https://doi.org/10.1016/s0306-4522(99)00327-9" @default.
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