Properties of the spike afterhyperpolarization in pyramidal tract neurons

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Abstract

Features of the spike afterhyperpolarization (AHP) recorded intracellularly have been analyzed in fast pyramidal tract neurons of cats. Cell input conductance increases during the AHP, possibly because of a change in potassium conductance, as suggested by an AHP equilibrium potential 10-15 mV negative to the resting membrane potential. When more spikes are evoked in succession, AHPs following the first one are strongly reduced in amplitude. The effect is virtually maximal (30-50% of the control) after a single spike and fades out by 200-400 ms after the last spike. At short interspike intervals the initial time course of the depression is hidden by summation occurring between consecutive AHPs. © 1983.

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Baldissera, F., Campadelli, P., Fava, E., & Piccinelli, L. (1983). Properties of the spike afterhyperpolarization in pyramidal tract neurons. Brain Research, 259(1), 143–146. https://doi.org/10.1016/0006-8993(83)91077-6

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