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  • Title: [Changes in the extracellular potassium concentration and the slow negative potential in the cerebral cortex].
    Author: Roĭtbak AI, Makhek I, Pavlik V, Bobrov AV, Ocherashvili IV.
    Journal: Neirofiziologiia; 1980; 12(5):459-63. PubMed ID: 7422035.
    Abstract:
    Changes of potassium concentration in the extracellular space ([K+]0) of the g. suprasylvius of cat cerebral cortex were recorded by means of K+ selective microelectrodes; the electrical field potential was recorded simultaneously. Under deep anesthesia a single electrical stimulus, applied to the cortical surface, at intensity enough to elicit the slow negativity, caused a local increase of [K+]0 reaching 0.1-1.5 mM. The time course of the K+ signal coincide with the course of the slow negativity. It is supposed that the slow negativity reflects glial depolarizaion arising under the action of K+ ions.
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